Area of semi & quarter circles

Front

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

Back

A = π r²

Front

What is the area of a semicircle with a radius of 7 cm? (Round to the nearest hundredth)

Back

76.93 cm²

Front

What is the area of a quarter circle with a radius of 10 cm? (Round to the nearest hundredth)

Back

78.50 cm²

Front

How do you calculate the area of a semicircle?

Back

Area = (π r²) / 2

Front

What is the area of a semicircle with a diameter of 10 cm? (Round to the nearest hundredth)

Back

19.63 cm²

Front

What is the area of a quarter circle with a diameter of 8 cm? (Round to the nearest hundredth)

Back

12.57 cm²

Front

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

Back

The area increases by a factor of 4.

Front

What is the relationship between the area of a circle and its radius?

Back

The area is proportional to the square of the radius.

Front

What is the area of a semicircle with a radius of 5 cm? (Round to the nearest hundredth)

Back

39.27 cm²

Front

What is the area of a quarter circle with a radius of 6 cm? (Round to the nearest hundredth)

Back

28.27 cm²