Area and Circumference Practice

Front

The distance halfway across the circle is called the...

Back

radius

Front

Find the area of a circle with a radius of 7 cm.

Back

153.86 cm²

Front

What is the area of a circle with a radius of 24 cm?

Back

452.39 cm²

Front

Is the red line a radius or diameter of the circle if it measures 10 cm?

Back

Radius

Front

Find the circumference of a circle with a radius of 7 cm.

Back

43.96 cm

Front

What is the formula for the area of a circle?

Back

A = πr², where A is the area and r is the radius.

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where C is the circumference and r is the radius.

Front

If the diameter of a circle is 14 cm, what is the radius?

Back

7 cm

Front

If the radius of a circle is doubled, how does the area change?

Back

The area increases by a factor of four.

Front

What is the circumference of a circle with a diameter of 10 cm?

Back

31.42 cm