Week 23 - Lesson 2: Area of circle

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

• 78.5 cm²

• 100 cm²

• 31.4 cm²

• 50 cm²

If the diameter of a circle is 10 cm, what is the radius?

• 3 cm

• 5 cm

• 10 cm

• 7 cm

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

• 3 cm

• 5 cm

• 6 cm

• 4 cm

Estimate the area of a circle with a radius of 4.5 m.

• 63.617 m²

• 50.265 m²

• 78.540 m²

• 28.274 m²

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

• The area decreases by a factor of 2.

• The area remains the same.

• The area increases by a factor of 3.

• The area increases by a factor of 4.

What is the area of a circle with a radius of 7 cm?

• 153.86 cm²

• 160.00 cm²

• 150.00 cm²

• 154.00 cm²

A pizza has a diameter of 14 inches. What is its area?

• Approximately 120 square inches

• Approximately 200 square inches

• Approximately 153.94 square inches

• Approximately 100 square inches

If a circle's area is 78.5 cm², what is its diameter?

• 8 cm

• 10 cm

• 15 cm

• 12 cm

Estimate the area of a circle with a radius of 10 m.

• 314 m²

• 400 m²

• 250 m²

• 150 m²

If the diameter of a circle is 16 cm, what is the radius?

• 10 cm

• 8 cm

• 6 cm

• 12 cm