Circumference and Area of Circles

Front

What does area mean?

Back

The amount of space inside a shape.

Front

What is the diameter of a circle?

Back

The distance across the circle through its center.

Front

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

Back

Radius.

Front

What is circumference?

Back

The distance around a circle.

Front

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

Back

3.5 cm.

Front

What is the formula for the circumference of a circle?

Back

C = πd or C = 2πr.

Front

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

Back

78.54 cm² (Area = πr²).

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius (d = 2r).

Front

How do you calculate the area of a circle?

Back

Area = πr².

Front

What is the value of π (pi) approximately?

Back

3.14.