Circumference & Area of Circles & Semi-Circles

Front

Diameter

Back

distance across the circle through the center

Front

radius

Back

distance from the center to any point on the circle

Front

What is the formula for finding diameter?

Back

d = 2r

Front

What is the formula for finding radius?

Back

r = d/2

Front

What is the formula for finding the area of a circle?

Back

A = π r²

Front

Formula for finding the area of a semi-circle

Back

A = π r² / 2

Front

Find the area of the circle

Back

153.86

Front

Find the area of the circle.

Back

28.26 cm

Front

Area of Mrs. Wilson's welcome mat in square feet (leave in terms of π)?

Back

8π

Front

Find the area of the circle

Back

81π