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Intermediate Geometry : How to find the angle of a sector

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Example Question #21 : How To Find The Angle Of A Sector

A sector in a circle with a radius of has and area of $34\pi$ . In degrees, what is the measurement of the central angle of the sector?

Possible Answers:

$350^\circ$

$345^\circ$

$340^\circ$

$355^\circ$

Correct answer:

$340^\circ$

Explanation:

Recall how to find the area of a sector:

$\text{Area of Sector}=\frac{\text{Measurement of Central Angle}}{360}\times\pi\times r^2$

Since the question asks for the measurement of the central angle, rearrange the equation like thus:

$\text{Measurement of Central Angle}=\frac{360\times\text{Area of Sector}}{\pi\times r^2}$

Plug in the given information to find the measurement of the central angle.

$\text{Measurement of Central Angle}=\frac{360\times 34\pi}{\pi\times 6^2}=\frac{12240\pi}{36\pi}=340$

The central angle is 340 degrees.

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Example Question #22 : How To Find The Angle Of A Sector

A sector in a circle with a radius of has an area of $16\pi$ . In degrees, what is the measurement of the central angle of the circle?

Possible Answers:

$71.11^\circ$

$74.11^\circ$

$72.11^\circ$

$81.11^\circ$

Correct answer:

$71.11^\circ$

Explanation:

Recall how to find the area of a sector:

$\text{Area of Sector}=\frac{\text{Measurement of Central Angle}}{360}\times\pi\times r^2$

Since the question asks for the measurement of the central angle, rearrange the equation like thus:

$\text{Measurement of Central Angle}=\frac{360\times\text{Area of Sector}}{\pi\times r^2}$

Plug in the given information to find the measurement of the central angle.

$\text{Measurement of Central Angle}=\frac{360\times 16\pi}{\pi\times 9^2}=\frac{5760\pi}{81\pi}=71.11$

The central angle is 71.11 degrees.

Make sure to round to places after the decimal.

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Example Question #23 : How To Find The Angle Of A Sector

A sector in a circle with a radius of has an area of $9\pi$ . In degrees, what is the measurement of the central angle of the sector?

Possible Answers:

$35^\circ$

$25^\circ$

$40^\circ$

$30^\circ$

Correct answer:

$40^\circ$

Explanation:

Recall how to find the area of a sector:

$\text{Area of Sector}=\frac{\text{Measurement of Central Angle}}{360}\times\pi\times r^2$

Since the question asks for the measurement of the central angle, rearrange the equation like thus:

$\text{Measurement of Central Angle}=\frac{360\times\text{Area of Sector}}{\pi\times r^2}$

Plug in the given information to find the measurement of the central angle.

$\text{Measurement of Central Angle}=\frac{360\times 9\pi}{\pi\times 9^2}=\frac{3240\pi}{81\pi}=40$

The central angle is degrees.

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Example Question #24 : How To Find The Angle Of A Sector

A sector in a circle with a radius of has an area of $2\pi$ . In degrees, what is the measurement of the central angle of the sector?

Possible Answers:

$12.89^\circ$

$6.89^\circ$

$8.89^\circ$

$10.89^\circ$

Correct answer:

$8.89^\circ$

Explanation:

Recall how to find the area of a sector:

$\text{Area of Sector}=\frac{\text{Measurement of Central Angle}}{360}\times\pi\times r^2$

Since the question asks for the measurement of the central angle, rearrange the equation like thus:

$\text{Measurement of Central Angle}=\frac{360\times\text{Area of Sector}}{\pi\times r^2}$

Plug in the given information to find the measurement of the central angle.

$\text{Measurement of Central Angle}=\frac{360\times 2\pi}{\pi\times 9^2}=\frac{720\pi}{81\pi}=8.89$

The central angle is 8.89 degrees.

Make sure to round to places after the decimal.

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Example Question #25 : How To Find The Angle Of A Sector

A sector in a circle with a radius of has an area of $3\pi$ . In degrees, what is the measurement of the central angle of the sector?

Possible Answers:

$13.33^\circ$

$16.33^\circ$

$9.33^\circ$

$10.33^\circ$

Correct answer:

$13.33^\circ$

Explanation:

Recall how to find the area of a sector:

$\text{Area of Sector}=\frac{\text{Measurement of Central Angle}}{360}\times\pi\times r^2$

Since the question asks for the measurement of the central angle, rearrange the equation like thus:

$\text{Measurement of Central Angle}=\frac{360\times\text{Area of Sector}}{\pi\times r^2}$

Plug in the given information to find the measurement of the central angle.

$\text{Measurement of Central Angle}=\frac{360\times 3\pi}{\pi\times 9^2}=\frac{1080\pi}{81\pi}=13.33$

The central angle is 13.33 degrees.

Make sure to round to places after the decimal.

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Example Question #26 : How To Find The Angle Of A Sector

A sector in a circle with a radius of has an area of $12\pi$ . In degrees, what is the measurement of the central angle of the sector?

Possible Answers:

$60^\circ$

$15^\circ$

$40^\circ$

$30^\circ$

Correct answer:

$30^\circ$

Explanation:

Recall how to find the area of a sector:

$\text{Area of Sector}=\frac{\text{Measurement of Central Angle}}{360}\times\pi\times r^2$

Since the question asks for the measurement of the central angle, rearrange the equation like thus:

$\text{Measurement of Central Angle}=\frac{360\times\text{Area of Sector}}{\pi\times r^2}$

Plug in the given information to find the measurement of the central angle.

$\text{Measurement of Central Angle}=\frac{360\times 12\pi}{\pi\times 12^2}=\frac{4320\pi}{144\pi}=30$

The central angle is degrees.

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Example Question #27 : How To Find The Angle Of A Sector

A sector in a circle with a radius of has an area of $100\pi$ . In degrees, what is the measurement of the central angle of the sector?

Possible Answers:

$250^\circ$

$160^\circ$

$190^\circ$

$220^\circ$

Correct answer:

$250^\circ$

Explanation:

Recall how to find the area of a sector:

$\text{Area of Sector}=\frac{\text{Measurement of Central Angle}}{360}\times\pi\times r^2$

Since the question asks for the measurement of the central angle, rearrange the equation like thus:

$\text{Measurement of Central Angle}=\frac{360\times\text{Area of Sector}}{\pi\times r^2}$

Plug in the given information to find the measurement of the central angle.

$\text{Measurement of Central Angle}=\frac{360\times 100\pi}{\pi\times 12^2}=\frac{36000\pi}{144\pi}=250$

The central angle is 250 degrees.

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Example Question #121 : Sectors

A sector in a circle with a radius of has an area of $120\pi$ . In degrees, what is the measurement of the central angle of the sector?

Possible Answers:

$280^\circ$

$320^\circ$

$300^\circ$

$250^\circ$

Correct answer:

$300^\circ$

Explanation:

Recall how to find the area of a sector:

$\text{Area of Sector}=\frac{\text{Measurement of Central Angle}}{360}\times\pi\times r^2$

Since the question asks for the measurement of the central angle, rearrange the equation like thus:

$\text{Measurement of Central Angle}=\frac{360\times\text{Area of Sector}}{\pi\times r^2}$

Plug in the given information to find the measurement of the central angle.

$\text{Measurement of Central Angle}=\frac{360\times 120\pi}{\pi\times 12^2}=\frac{43200\pi}{144\pi}=300$

The central angle is 300 degrees.

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Example Question #121 : Plane Geometry

A sector in a circle with a radius of has an area of $45\pi$ . In degrees, what is the measurement of the central angle of the sector?

Possible Answers:

$118.5^\circ$

$100.5^\circ$

$112.5^\circ$

$106.5^\circ$

Correct answer:

$112.5^\circ$

Explanation:

Recall how to find the area of a sector:

$\text{Area of Sector}=\frac{\text{Measurement of Central Angle}}{360}\times\pi\times r^2$

Since the question asks for the measurement of the central angle, rearrange the equation like thus:

$\text{Measurement of Central Angle}=\frac{360\times\text{Area of Sector}}{\pi\times r^2}$

Plug in the given information to find the measurement of the central angle.

$\text{Measurement of Central Angle}=\frac{360\times 45\pi}{\pi\times 12^2}=\frac{16200\pi}{144\pi}=112.5$

The central angle is 112.5 degrees.

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Example Question #121 : Circles

Circle z

Refer to the above figure.

True, false, or undetermined: $\angle AWB$ is a right angle.

Possible Answers:

Undetermined

False

True

Correct answer:

True

Explanation:

$\angle AVB$ and $\angle AWB$ , being inscribed angles of the same circle which intercept the same arc, are congruent angles. $\angle AVB$ is right, so $\angle AWB$ must also be right.

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Intermediate Geometry : How to find the angle of a sector

Study concepts, example questions & explanations for Intermediate Geometry

All Intermediate Geometry Resources

Example Questions

Example Question #21 : How To Find The Angle Of A Sector

Example Question #22 : How To Find The Angle Of A Sector

Example Question #23 : How To Find The Angle Of A Sector

Example Question #24 : How To Find The Angle Of A Sector

Example Question #25 : How To Find The Angle Of A Sector

Example Question #26 : How To Find The Angle Of A Sector

Example Question #27 : How To Find The Angle Of A Sector

Example Question #121 : Sectors

Example Question #121 : Plane Geometry

Example Question #121 : Circles

All Intermediate Geometry Resources

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