Area and Circumference of Circles

Front

What is circumference?

Back

The distance around a circle.

Front

What is the area of a circle with a radius of 5 cm?

Back

78.54 cm² (Area = πr², where r = 5 cm)

Front

If the diameter of a circle is 10 cm, what is the circumference?

Back

31.42 cm (Circumference = πd, where d = 10 cm)

Front

What is the radius of a circle?

Back

A line from the center point to the edge of the circle.

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius.

Front

What is the formula for the circumference of a circle?

Back

Circumference = πd, where d is the diameter.

Front

If the radius of a circle is 7 cm, what is the area?

Back

153.94 cm² (Area = πr², where r = 7 cm)

Front

What is the diameter of a circle with a radius of 4 cm?

Back

8 cm (Diameter = 2r, where r = 4 cm)

Front

What is the circumference of a circle with a radius of 3 cm?

Back

18.84 cm (Circumference = 2πr, where r = 3 cm)

Front

If the area of a circle is 50.27 cm², what is the radius?

Back

4 cm (Area = πr², solve for r)