Area of partial circles

Front

What is the formula for the area of a circle?

Back

A = πr², where A is the area and r is the radius.

Front

What is a quarter circle?

Back

A quarter circle is one-fourth of a full circle, formed by cutting the circle along two radii.

Front

How do you calculate the area of a quarter circle?

Back

To find the area of a quarter circle, use the formula A = (1/4)πr².

Front

What is a semicircle?

Back

A semicircle is half of a circle, formed by cutting the circle along its diameter.

Front

How do you calculate the area of a semicircle?

Back

To find the area of a semicircle, use the formula A = (1/2)πr².

Front

What is a three-quarter circle?

Back

A three-quarter circle is three-fourths of a full circle, formed by cutting the circle along three radii.

Front

How do you calculate the area of a three-quarter circle?

Back

To find the area of a three-quarter circle, use the formula A = (3/4)πr².

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

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

Back

A = π(7)² = 154 cm² (approximately).

Front

If the radius of a semicircle is 4 cm, what is the area?

Back

A = (1/2)π(4)² = 25.13 cm² (approximately).