Circumference and Area

Front

What does C represent in the formula: C = π·d?

Back

Circumference

Front

What number represents π?

Back

3.14

Front

What is the formula to find the area of a circle?

Back

A = π·r², where A is area and r is radius.

Front

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

Back

5 cm (Radius is half of the diameter).

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius.

Front

How do you calculate the circumference of a circle?

Back

C = π·d or C = 2·π·r.

Front

What is the area of a circle with a radius of 7 cm?

Back

A = π·(7)² = 153.86 cm².

Front

What is the value of π to two decimal places?

Back

3.14

Front

If a circle has a circumference of 31.4 cm, what is its diameter?

Back

10 cm (C = π·d, so d = C/π).

Front

What is the formula for the area of a rectangle?

Back

A = length × width.