Area of a circle

Front

What is the formula for finding the area of a circle?

Back

A = π·r²

Front

What does 'r' represent in the formula A = π·r²?

Back

radius

Front

What is the circumference of a circle?

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

Calculate the area of a circle with a radius of 4 cm (use π ≈ 3.14).

Back

50.24 cm²

Front

What is the diameter of a circle if the radius is 5 cm?

Back

10 cm

Front

If the area of a circle is 78.5 cm², what is the radius? (Use π ≈ 3.14)

Back

5 cm

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius.

Front

How do you convert diameter to radius?

Back

Divide the diameter by 2.

Front

What is the area of a circle with a diameter of 10 cm? (Use π ≈ 3.14)

Back

78.5 cm²