Area of a circle

Front

What is the formula for the area of a circle?

Back

The area of a circle is calculated using the formula A = πr², where A is the area and r is the radius.

Front

If the radius of a circle is 2 cm, what is the area in terms of π?

Back

The area is 4π cm².

Front

How do you convert the area of a circle from terms of π to a decimal?

Back

Multiply the area in terms of π by the approximate value of π (3.14) to convert it to a decimal.

Front

What is the area of a circle with a radius of 5 cm, rounded to one decimal place?

Back

The area is 78.5 cm².

Front

If the area of a circle is 16π cm², what is the radius?

Back

The radius is 4 cm.

Front

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

Back

The diameter is twice the radius (d = 2r).

Front

If a circle has an area of 201.0 cm², what is the radius?

Back

The radius is approximately 7.99 cm.

Front

What is the area of a circle with a diameter of 10 cm?

Back

The area is 78.5 cm².

Front

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

Back

Use the formula A = C² / (4π), where C is the circumference.

Front

What is the area of a circle with a radius of 3 cm, leaving the answer in terms of π?

Back

The area is 9π cm².