Area of semicircles and quarter circles

Front

What is the area of a quarter circle with radius r?

Back

A = (1/4)πr²

Front

What is the area of a semicircle with radius r?

Back

A = (1/2)πr²

Front

What is the formula for the area of a rectangle?

Back

A = length × width

Front

What is the formula for the area of a parallelogram?

Back

A = base × height

Front

What is the value of π (pi) approximately?

Back

π ≈ 3.14

Front

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

Back

A = π(4)² = 50.24 cm²

Front

How do you find the area of a circle?

Back

Use the formula A = πr².

Front

What is the area of a rectangle with length 5 ft and width 2 ft?

Back

A = 5 ft × 2 ft = 10 ft²

Front

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

Back

A = (1/2)π(5)² = 39.25 cm²

Front

What is the area of a quarter circle with a radius of 6 m?

Back

A = (1/4)π(6)² = 28.27 m²