Area and Properties of Circles Practice

Front

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

Back

πr²

Front

What is the formula to calculate the circumference of a circle?

Back

2πr

Front

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

Back

5 cm

Front

What is the value of π (pi) approximately?

Back

3.14

Front

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

Back

Use the formula r = √(Area/π).

Front

What is the circumference of a circle with a radius of 7 cm? (Use 3.14 for π)

Back

43.96 cm

Front

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

Back

The area increases by a factor of 4.

Front

What is the area of a circle with a radius of 4 cm? (Use 3.14 for π)

Back

50.24 cm²

Front

How do you calculate the diameter of a circle?

Back

Diameter = 2 × radius.

Front

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

Back

Diameter = 2 × radius; Radius = Diameter/2.