Understanding Circle Areas

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

• 50 cm²

• 100 cm²

• 31.4 cm²

• 78.5 cm²

Calculate the area of a circle with a diameter of 10 m.

• 78.54 m²

• 100.00 m²

• 50.24 m²

• 31.42 m²

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

• The area decreases by a factor of 4.

• The area remains the same.

• The area increases by a factor of 4.

• The area increases by a factor of 2.

Find the area of a circle with a radius of 7.5 inches.

• 120.50 square inches

• 150.80 square inches

• 176.71 square inches

• 200.00 square inches

What is the area of a circle with a circumference of 31.4 cm?

• 100 cm²

• 50.3 cm²

• 78.5 cm²

• 62.8 cm²

Calculate the area of a circle with a radius of 2.5 feet.

• 15.70 square feet

• 10.00 square feet

• 31.42 square feet

• 19.63 square feet

If the area of a circle is 50.24 cm², what is its radius?

• 6 cm

• 3 cm

• 4 cm

• 5 cm

Determine the area of a circle with a radius of 4.2 m.

• 55.41 m²

• 45.12 m²

• 60.78 m²

• 50.24 m²

What is the area of a circle if the radius is 10 cm?

• 400 cm²

• 200 cm²

• 150 cm²

• 314 cm²

If a circle has an area of 78.5 m², what is the radius?

• 5 m

• 10 m

• 3 m

• 7 m