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ACT Math : Quadrilaterals

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Example Question #51 : Quadrilaterals

A kite has a side length of $15\textup{ inches}$ and another side length of $30\textup{ inches}$ . Find the perimeter of the kite.

Possible Answers:

$7.5\textup{ feet}$

$87\textup{ inches}$

$45\textup{ inches}$

$90 \textup{ cm}$

$12\textup{ feet}$

Correct answer:

$7.5\textup{ feet}$

Explanation:

By definition a kite must have two sets of equivalent sides. Since we know that this kite has a side length of and another side with a length of , each of these two sides must have one equivalent side.

The perimeter of this kite can be found by applying the formula:

p=2(a+b)

p=2(15+30)

$p=2(45)=90\textup{ inches}$

Note, though, that $90\textup{ inches}$ does not appear as an answer choice. Thus, convert $90\textup{ inches}$ into $\textup{feet}$ by: $90\div12=7.5\textup{ feet}$

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Example Question #52 : Quadrilaterals

A kite has a side length of $88\textup{mm}$ and another side length of $36\textup{mm}$ . Find the perimeter of the kite.

Possible Answers:

$209\textup{mm}$

$209\textup{cm}$

$264\textup{mm}$

$176\textup{mm}$

$248\textup{mm}$

Correct answer:

$248\textup{mm}$

Explanation:

a kite must have two sets of equivalent sides. Since we know that this kite has a side length of $88\textup{mm}$ and another side with a length of $36\textup{mm}$ , each of these two sides must have one equivalent side.

The perimeter of this kite can be found by applying the formula:

p=2(a+b)

p=2(88+36)

$p=2(124)=248\textup{mm}$

Note: the correct solution can also be found by:

p=88+88+36+36=176+72=248

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Example Question #53 : Quadrilaterals

A kite has a side length of $12\textup{cm}$ and another side length of $16\textup{cm}$ . Find the perimeter of the kite.

Possible Answers:

$56\textup{cm}$

$96\textup{in}$

$90\textup{cm}$

$60\textup{cm}$

$24\textup{cm}$

Correct answer:

$56\textup{cm}$

Explanation:

A kite must have two sets of equivalent sides. Since we know that this kite has a side length of and another side length of , each of these two sides must have one equivalent side.

The perimeter of this kite can be found by applying the formula:

p=2(a+b)

p=2(12+16)

$p=2(28)=56\textup{cm}$

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Example Question #1 : How To Find The Area Of A Kite

Find the area of a kite with the diagonal lengths of and .

Possible Answers:

4a+4b

2a+2b

2ab

4ab

Correct answer:

2ab

Explanation:

Write the formula to find the area of a kite. Substitute the diagonals and solve.

$A=\frac{d1 \cdot d2}{2} = \frac{2a \cdot 2b}{2} =2ab$

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Example Question #11 : Geometry

Find the area of a kite with diagonal lengths of a+b and 2a-2b .

Possible Answers:

a^2+b^2

a^2-ab-b^2

2a^2+2b^2

a^2-b^2

2a^2-2b^2

Correct answer:

a^2-b^2

Explanation:

Write the formula for the area of a kite.

$A= \frac{d1\cdot d2}{2}$

Plug in the given diagonals.

$A= \frac{(a+b)\cdot (2a-2b)}{2}$

Pull out a common factor of two in 2a-2b and simplify.

$A= \frac{(a+b)\cdot2(a-b)}{2}$

A=(a+b)(a-b)

Use the FOIL method to simplify.

A=(a+b)(a-b)= (a)(a)+(a)(-b)+(b)(a)+(b)(-b)

A= a^2-b^2

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Example Question #9 : How To Find The Area Of A Kite

Find the area of a kite if one diagonal is $2\:cm$ long, and the other diagonal is $10\:cm$ long.

Possible Answers:

$10\sqrt2\:cm^2$

$20\:cm^2$

$3\sqrt{10}$ cm^2

$10\sqrt3\:cm^2$

$10\:cm^2$

Correct answer:

$10\:cm^2$

Explanation:

The formula for the area of a kite is

$A=\frac{d_1\cdot d_2}{2}$

Plug in the values for each of the diagonals and solve.

$A = \frac{2\cdot 10}{2}=\frac{20}{2}=10\:cm^2$

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Example Question #1 : How To Find The Perimeter Of A Trapezoid

If a trapezoid has a height of 14, base lengths of 10 and 12, and side lengths of 13, what is its perimeter?

Possible Answers:

Correct answer:

Explanation:

Use the formula for perimeter of a trapezoid:

$P=b_{1}+b_{2}+s+s$

Where is the perimeter, b_1 and b_2 are the lengths of the bases, and is the length of the side.

In this case:

P=10+12+13+13=48

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Example Question #1 : How To Find An Angle In A Trapezoid

Find the measure of angle in the isosceles trapezoid pictured below.

Screen_shot_2013-03-18_at_3.32.40_pm

Possible Answers:

$18^{\circ}$

$118^{\circ}$

$108^{\circ}$

$72^{\circ}$

$36^{\circ}$

Correct answer:

$108^{\circ}$

Explanation:

The sum of the angles in any quadrilateral is 360°, and the properties of an isosceles trapezoid dictate that the sets of angles adjoined by parallel lines (in this case, the bottom set and top set of angles) are equal. Subtracting 2(72°) from 360° gives the sum of the two top angles, and dividing the resulting 216° by 2 yields the measurement of x, which is 108°.

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Example Question #2 : How To Find An Angle In A Trapezoid

Trapezoid ABCD is an isosceles trapezoid with angle $\angle C = 35^{\circ}$ . If $\angle A$ and $\angle B$ are paired, what is the measure of $\angle A$ ?

Possible Answers:

$215^{\circ}$

$55^{\circ}$

$145^{\circ}$

$35^{\circ}$

$30^{\circ}$

Correct answer:

$145^{\circ}$

Explanation:

As a rule, adjacent (non-paired) angles in a trapezoid are supplementary. Thus, we know that if $\angle C = 35^{\circ}$ , then $\angle B = 145^{\circ}$ . Since we are told that $\angle A$ and $\angle B$ are paired and trapezoid ABCD is isosceles, $\angle A$ must also equal $145^{\circ}$ .

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Example Question #1 : How To Find An Angle In A Trapezoid

In the isosceles trapezoid above,

$\overline{AB}\left | \right | \overline{DC}$ . $\angle BDC = 50^{\circ}$ and $\angle BCA = 15^{\circ}$ .

In degrees, what is the measure of $\angle DAC$ ?

Possible Answers:

$115^\circ$

$65^\circ$

$80^\circ$

$75^\circ$

$35^\circ$

Correct answer:

$65^\circ$

Explanation:

To find the measure of angle DAC, we must know that the interior angles of all triangles sum up to 180 degrees. Also, as this is an isosceles trapezoid, $\angle ADC$ and $\angle BCD$ are equal to each other. The two diagonals within the trapezoid bisect angles $\angle ADC$ and $\angle BCD$ at the same angle.

Thus, $\angle ACD$ must also be equal to 50 degrees.

Thus, $\angle ADC = 50 + 15 = 65$ .

Now that we know two angles out of the three in the triangle on the left, we can subtract them from 180 degrees to find $\angle DAC$ :

180-65-50=65

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ACT Math : Quadrilaterals

Study concepts, example questions & explanations for ACT Math

All ACT Math Resources

Example Questions

Example Question #51 : Quadrilaterals

Example Question #52 : Quadrilaterals

Example Question #53 : Quadrilaterals

Example Question #1 : How To Find The Area Of A Kite

Example Question #11 : Geometry

Example Question #9 : How To Find The Area Of A Kite

Example Question #1 : How To Find The Perimeter Of A Trapezoid

Example Question #1 : How To Find An Angle In A Trapezoid

Example Question #2 : How To Find An Angle In A Trapezoid

Example Question #1 : How To Find An Angle In A Trapezoid

All ACT Math Resources

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