Circle Area and Circumference Concept Check

Front

Is the red line a radius or diameter of the circle?

Back

Radius

Front

Is the red line a radius or diameter of the circle?

Back

Diameter

Front

What is the diameter of this circle? d = 2r

Back

10 in

Front

What is the radius of this circle? r = d/2

Back

9

Front

Find the area of the circle with radius 3 cm. A = r²π

Back

28.26 cm²

Front

Find the circumference C = 2rπ

Back

87.92in

Front

Find the area of the circle. A = r²π

Back

254.34

Front

Determine the radius of the penny: 59.66 mm, 9.5 mm, 38 mm

Back

9.5 mm

Front

Radius of a cookie: 5 inches. What is the cookie’s circumference? C = 2rπ

Back

31.4 in

Front

What is the circumference of a bowl with a diameter of 14 cm? C = dπ

Back

43.98 cm