Area of a Circle

Front

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

Back

A = π·r²

Front

What does 'π' represent in the area formula?

Back

Pi, approximately 3.14.

Front

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

Back

A = π·7² = 153.86 cm².

Front

What is the relationship between diameter and radius?

Back

The radius is half of the diameter.

Front

If the diameter of a circle is 20 m, what is the radius?

Back

10 m.

Front

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

Back

Area of the circle.

Front

How do you convert diameter to radius?

Back

Divide the diameter by 2.

Front

What is the area of a circle with a radius of 5 inches?

Back

A = π·5² = 78.54 in².

Front

What is the circumference of a circle with a radius of 3 m?

Back

C = 2·π·3 = 18.84 m.

Front

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

Back

The area increases by a factor of four.