Area vs Circumference

Front

What is the formula for the area of a circle?

Back

A = πr²

Front

What is the formula for the circumference of a circle?

Back

C = 2πr

Front

What is the value of pi (π) to two decimal places?

Back

3.14

Front

If a circle has a radius of 5 cm, what is its area?

Back

78.54 cm²

Front

If a circle has a radius of 7 m, what is its circumference?

Back

43.98 m

Front

What does the term 'diameter' refer to in a circle?

Back

The diameter is the distance across the circle through its center, equal to twice the radius.

Front

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

Back

5 ft

Front

What is the relationship between the radius and diameter of a circle?

Back

The diameter is twice the radius.

Front

How do you find the area of a circle if you know the diameter?

Back

First, divide the diameter by 2 to get the radius, then use A = πr².

Front

What is the circumference of a circle with a diameter of 8 inches?

Back

25.13 inches