Area of Circles and Semi-Circles

find the area of the circle below.

• 100 cm

• 225 cm

• 9 cm

• 28.26 cm

Mrs. Wilson placed the welcome mat shown below on her front door step. What is the area of her welcome mat in square feet? Leave in terms of π.

• 2π

• 8π

• 10π

• 4π

How do you find the area of a circle?

What is the perimeter of the semi-circle?

• 11 yd

• 17.27 yd

• 34.54 yd

• 28.27 yd

If you fold a circle in half, what shape have you created?

• Quarter circle

• Semi-circle

• a taco

• another circle

Find the area of the circle

• 43.96

• 153.86

• 87.82

• 307.72

Find the area of the circle

• 8π

• 9π

• 71π

• 81π

Daniel wants to buy cookies for her friend. The
radius of a cookie is 5 inches. What is the cookie’s 
circumference?

• 10 in

• 2.5 in

• 15.7 in

• 31.4 in 

Find the area of the composite figure.

• 100

• 400

• 137.5

• 175

Solve.

• 78.5 cm²

• 100 cm²

• 21.5 cm²

• 121.5 cm²