Circle Area and Perimeter

Area, Perimeter, Circumference

Perimeter

Add all sides together

Multiple Choice

Find the perimeter of the triangle.

• 120 ft.

• 32 ft.

• 40 ft.

• 20 ft.

Multiple Choice

Find the perimeter of the rectangle.

• 38 cm.

• 19 cm.

• 84 cm.

• 42 cm.

Area of a rectangle

Multiply length by width

Multiple Choice

Find the AREA of this figure.

• $$160\ ft.^2$$

• 160 ft.

• $$80\ ft.\ ^2$$

• 1600 feet

Area of a Square

Multiply side by side

Fill in the Blanks

What is the area of this square?

Area of a Parallelogram

Multiply base by height

Multiple Choice

Find the area

• 430 in²
• 215 in²
• 41.5 in²
• 1.5 in²

Area of a Triangle

Multiply base by height then cut it in half (divide by 2)

Multiple Choice

Why do you need to divide by 2 when solving the area of a triangle?

• A triangle is half the size of a square.

• A triangle only has three sides.

• A triangle is half the size of a rectangle or square.

• A triangle is not a polygon.

Fill in the Blanks

What is the area of this triangle?

Area of a Trapezoid

Add the bases together

Multiply by the height

Then cut it in half (divide by 2)

Multiple Choice

Find the Area.

• 91 ft²

• 77 ft²

• 78 ft²

• 105 ft²

Circumference

​Basically the "perimeter" of the circle

Multiply 2 times the radius and π

or

Multiply the diameter by π

​

Multiple Choice

What is the diameter?

• 5 in
• 10 in
• 3.14 in
• 15.84 in

Multiple Choice

What is the radius of this circle?

• 18
• 10
• 9
• 8

Multiple Choice

Find the circumference. Round to the nearest tenth.

• 18.8 cm.

• 75.4 cm.

• 37.7 cm.

• not enough information

Multiple Choice

Find the circumference of the circle. Round to the nearest tenth.

• 113.0 in.

• 1017.4 in.

• 254.3 in.

• 56.5 in.

Area of a Circle

Square the radius

Multiply by π

Multiple Choice

Find the area of the circle

• 43.96
• 153.86
• 87.82
• 307.72