Area of Rectangles, Triangles and Circles

What is the radius of this circle?

• 12
• 6
• 24

Answer explanation

From center to outside (Halfway across the circle)

What is the area of this circle?

• 1384.74

• 2142.12

• 5541.77

• 1289.12

Answer explanation

Area of circle = pi x (radius squared)

A = (3.14)(21)(21)

A=1,384.74

What is the area of this circle?

• 1256.64

• 31.41

• 314

• 123.12

Answer explanation

A = Pi x (radius squared)

They gave you the diameter not radius, so you must change to radius by dividing by 2.

20/2 = 10 <- this is my radius

A = (3.14) (10) (10)

A= 314

What is the area of this circle?

• 201.06

• 50.24

• 123.12

• 94.43

Answer explanation

You have the radius.

A = 3.14 (4) (4)

A = 50.24

What is/are the formula(s) to find the area of a circle?

• πr²
• 2πr
• √π

Tags

CCSS.7.G.B.4

What does area mean?

• the distance around a shape
• half the distance around a shape
• the amount of space outside a shape
• the amount of space inside a shape

Answer explanation

Distance around the circle - circumference

The diameter of the face-off circle on an ice-hockey rink is 30 feet. Find its area.

• 675.6 ft²
• 29.67 ft²
• 545.8 ft²
• 706.5 ft²

Answer explanation

Given diameter not radius.

30/2 = 15

A = 3.14 (15)(15)

A = 706.5

What is the area of the rectangle?

• 42 square cm
• 40 square cm
• 13 square cm

• 18 square cm

Answer explanation

A = bh

A = (5)(8)

A = 40

Greyson and Preston have a piece of paper that is 10 inches by 9 inches.  What is the area of the paper?

• 100 sq. in.
• 79 sq. in.
• 90 sq. in.
• 80 sq. in.

Answer explanation

Paper is in the shape of rectangle.

Area of the rectangle = base x height

A = (10) (9)

A = 90

Calculate the area of this shape

• 84 cm²

• 19 cm²

• 24 cm²

• 38cm²

Answer explanation

A = bh

A = (12)(7)

A = 84 sq cm.