How to find the area of a rectangle

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SAT Math › How to find the area of a rectangle

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Find the area of a rectangle given width 6 and length 9.

CORRECT

Explanation

To solve, simply multiply the width by the length. Using the formula, you get the answer as follows:

Additionally, you can alternatively solve this problem by drawing out a rectangle, creating 6 horizontal lines and 9 vertical ones, and then adding up the squares to reach your answer.

George wants to paint the walls in his room blue. The ceilings are 10 ft tall and a carpet 12 ft by 15 ft covers the floor. One gallon of paint covers 400 $ft^{2}$ and costs \$40. One quart of paint covers 100 $ft^{2}$ and costs \$15. How much money will he spend on the blue paint?

$\$70$

CORRECT

$\$80$

$\$40$

$\$30$

$\$55$

Explanation

The area of the walls is given by $A = 2wh + 2lh = 2(12)(10) + 2(15)(10) = 540 ft^{2}$

One gallon of paint covers 400 $ft^{2}$ and the remaining 140 $ft^{2}$ would be covered by two quarts.

So one gallon and two quarts of paint would cost

Para-rec1

Rectangle ABCD is shown in the figure above. Points A and B lie on the graph of y = 64 – _x_2 , and points C and D lie on the graph of y = _x_2 – 36. Segments AD and BC are both parallel to the y-axis. The x-coordinates of points A and B are equal to –k and k, respectively. If the value of k changes from 2 to 4, by how much will the area of rectangle ABCD increase?

272

544

176

CORRECT

352

Explanation

Para-rec2

Para-rec3

A parallelogram with right angles has side lengths of and . What is its area?

CORRECT

Cannot be determined

Explanation

Remember that a parallelogram with right angles is a rectangle. With that in mind, all you need to do is multiply those side lengths together, knowing that they are the length and width of a rectangle:

You have a poster of one of your favorite bands that you are planning on putting up in your dorm room. If the poster is 3 feet tall by 1.5 feet wide, what is the area of the poster?

CORRECT

Explanation

You have a poster of one of your favorite bands that you are planning on putting up in your dorm room. If the poster is 3 feet tall by 1.5 feet wide, what is the area of the poster?

Area of a rectangle is found via:

Find the area of a rectangle with side length 7 and 9.

CORRECT

$\frac{63}{2}$

Explanation

To solve, simply use the formula for the area of a rectangle.

Substitute in the side length of 7 and width of 9.

Thus,

Two circles of a radius of each sit inside a square with a side length of . If the circles do not overlap, what is the area outside of the circles, but within the square?

$36-8\pi$

$64-8\pi$

CORRECT

$16+8\pi$

$36-6\pi$

$36-4\pi$

Explanation

The area of a square = $\dpi{100} \small side^{2}$

The area of a circle is $\dpi{100} \small \pi r^{2}$

Area = Area of Square $\dpi{100} \small -$ 2(Area of Circle) =

$8^{2}-2\cdot \pi (2)^{2}$

$64-8\pi$

Find the area of a rectanlge given width is 2 and length is 3.

CORRECT

Explanation

To solve, simply use the formula for the area of a rectangle. Thus,

If the area Rectangle A is larger than Rectangle B and the sides of Rectangle A are and , what is the area of Rectangle B?

CORRECT

Explanation

$A = \text{length}: \times :\text{width} = 10 \times 6 = 60$

$B =\frac{60}{1.25} = 48$

The front façade of a building is 100 feet tall and 40 feet wide. There are eight floors in the building, and each floor has four glass windows that are 8 feet wide and 6 feet tall along the front façade. What is the total area of the glass in the façade?

1536 ft2

CORRECT

1536 ft2

192 ft2

2464 ft2

768 ft2