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Basic Geometry : How to find the area of a rectangle

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

A rectangle has a perimeter of $40\; m$ . The length is ten meters more than the width. What is the area of the rectangle?

Possible Answers:

$60\; m^{2}$

$80\; m^{2}$

$75\; m^{2}$

$150\; m^{2}$

$120\; m^{2}$

Correct answer:

$75\; m^{2}$

Explanation:

Given a rectangle, the general equation for the perimeter is P = 2l + 2w and area is A = lw where is the length and is the width.

Let = width and x + 10 = length

So the equation to solve becomes 40 = 2x + 2(x+10) so x = 5 thus the width is $5\; m$ and the length is $15\; m$ .

Thus the area is $5\cdot 15= 75 \; m^{2}$

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

Which of the following information would not be sufficient to find the area of a rectangle?

Possible Answers:

The lengths of one side and a diagonal.

All of the other choices list information that would be sufficient.

The lengths of one pair of opposite sides.

The lengths of one pair of adjacent sides.

The perimeter and the length of one side.

Correct answer:

The lengths of one pair of opposite sides.

Explanation:

The area of a rectangle can be calculated by multiplying the lengths of two adjacent sides. All of the choices given lists sufficient information, with one exception. We examine each of the choices.

The lengths of one pair of adjacent sides: This choice is false, as is directly stated above.

The perimeter and the length of one side: Using the perimeter formula, you can find the length of an adjacent side, making this choice false.

The lengths of one side and a diagonal: using the Pythagorean Theorem, you can find the length of an adjacent side, making this choice false.

The lengths of one pair of opposite sides: this gives you no way of knowing the lengths of the adjacent sides. This is the correct choice.

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Example Question #3 : How To Find The Area Of A Rectangle

Find the area of the polygon.

Possible Answers:

165

160

175

180

200

Correct answer:

180

Explanation:

Drawing a vertical line at the end of the side of length divides the shape into a rectangle and a right triangle.

The sum of the areas of the two shapes is the area of the polygon. Multiply the length of the rectangle by its width to find the area of the rectangle, and use the formula $A = \frac{1}{2}bh$ , where is the base and is the height of the triangle, to find the area of the triangle. Adding them together gives the answer.

$A_{total}=A_{rec}+A_{tri}$

$A_{total}=(8*20)+\frac{1}{2}(5*8)$

A = 180

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Example Question #2 : How To Find The Area Of A Rectangle

One side of a rectangle is 7 inches and another is 9 inches. What is the area of the rectangle in inches?

Possible Answers:

Correct answer:

Explanation:

To find the area of a rectangle, multiply its width by its height. If we know two sides of the rectangle that are different lengths, then we have both the height and the width.

$9\cdot 7=63$

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Example Question #2 : How To Find The Area Of A Rectangle

What is the area of the rectangle in the diagram?

Possible Answers:

$19\ cm^{2}$

$84\ cm^{2}$

$49\ cm^{2}$

$144\ cm^{2}$

$90\ cm^{2}$

Correct answer:

$84\ cm^{2}$

Explanation:

The area of a rectangle is found by multiplying the length by the width.

Area=l(w)

The length is 12 cm and the width is 7 cm.

$12\cdot 7=84$

Therefore the area is 84 cm².

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Example Question #6 : How To Find The Area Of A Rectangle

What is the area of a rectangle whose length and width is inches and inches, respectively?

Possible Answers:

$220\, in^2$

$252\,in^2$

$148\, in^2$

$64\, in^2$

$128\, in^2$

Correct answer:

$252\,in^2$

Explanation:

The area of any rectangle with length, and width, is:

$A=l\times w$

$A=14\times 18$

$A=252\, in^2$

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Example Question #3 : How To Find The Area Of A Rectangle

What is the area of a rectangle that has a length of and a width of ?

Possible Answers:

Correct answer:

Explanation:

Recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Now, plug in the given length and width to find the area.

$\text{Area}=2 \times 20=40$

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

What is the area of a rectangle that has a length of and a width of ?

Possible Answers:

120

130

Correct answer:

120

Explanation:

Recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Now, plug in the given length and width to find the area.

$\text{Area}=12 \times 10= 120$

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

What is the area of a rectangle that has a length of and a width of ?

Possible Answers:

240

360

120

Correct answer:

240

Explanation:

Recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Now, plug in the given length and width to find the area.

$\text{Area}=8 \times 30= 240$

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

What is the area of a rectangle that has a length of 100 and a width of ?

Possible Answers:

104

600

400

200

Correct answer:

400

Explanation:

Recall how to find the area of a rectangle:

$\text{Area}=\text{length}\times\text{width}$

Now, plug in the given length and width to find the area.

$\text{Area}=100 \times 4= 400$

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Basic Geometry : How to find the area of a rectangle

Study concepts, example questions & explanations for Basic Geometry

All Basic Geometry Resources

Example Questions

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

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

Example Question #3 : How To Find The Area Of A Rectangle

Example Question #2 : How To Find The Area Of A Rectangle

Example Question #2 : How To Find The Area Of A Rectangle

Example Question #6 : How To Find The Area Of A Rectangle

Example Question #3 : How To Find The Area Of A Rectangle

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

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

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

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