Perimeter and Area of Triangles, Trapezoids and Rectangles

How can the area of a composite plane figure be determined?

• By adding the areas of the subdivisions

• By subtracting the areas of the subdivisions

• By dividing the areas of the subdivisions

• By multiplying the perimeters of the subdivisions

When solving contextual problems involving composite plane figures, what should be the final step?

• Subdividing the figure into known shapes

• Identifying the number of sides in the figure

• Finding the dimensions of the figure

• Calculating the area or perimeter of the entire figure

In a composite figure, what is the purpose of subdividing the figure into known shapes?

• To simplify calculations

• To change the shape of the figure

• To increase the area of the figure

• To decrease the perimeter of the figure

Which attribute is used to determine the perimeter of a composite plane figure?

• Circumference of the subdivisions

• Volume of the subdivisions

• Area of the subdivisions

The face of a lamp shade is shaped like a trapezoid. The dimensions of the face are shown in the diagram.

Which equation can be used to find A, the area of the face of the lamp shade in square inches?

• A = 1/2 (6 + 10) y

• A = 1/2 (6 + 10) x

• A = 1/2 (6) + (10) y

• A = 1/2 (6) + (10) x

The dimensions of a lawn shaped like a trapezoid are given in meters.

What is the area of the lawn in square meters?

• 108 square meters

• 60 square meters

• 120 square meters

• 72 square meters

Triangle PQR is shown.

PQ is 5 inches.

QR is 4 inches.

PR is 3 inches.

What is the area?

• 3.5 square inches

• 7 square inches

• 7.5 square inches

• 10 square inches

The length of a rectangle is 7 inches, and the area of the rectangle is 199.5 square inches. What is the width of the rectangle in inches?

• 28.5 in

• 192.5 in

• 1396.5 in

• 206.5 in

The playground at a park is shaped like a trapezoid. The dimensions of the playground are shown in the diagram.

What is the are is square feet?

• 3120 square feet

• 1560 square feet

• 1768 square feet

• 3536 square feet

A rectangular computer screen has an area of A square inches. The width of the computer screen is 7 inches. Which equation represents x, the length of the computer screen in inches?

• x = 7/A

• x = A + 27

• x = A - 2(7)

• x = A/7