Area and Circumference

Front

What is the diameter of a circle?

Back

A line through the center of a circle.

Front

What number represents π?

Back

3.14

Front

Find the circumference of a circle with a radius of 5 cm.

Back

31.4 cm (Circumference = 2πr, where r = 5 cm)

Front

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

Back

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

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr or Circumference = πd.

Front

What is the formula for the area of a circle?

Back

Area = πr².

Front

If the radius of a circle is doubled, what happens to the area?

Back

The area becomes four times larger.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Front

Find the circumference of a circle with a diameter of 10 cm.

Back

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

Front

What is the value of π to two decimal places?

Back

3.14