What is the formula to calculate the area of a circle?

• A = 2πr

• A = r^2

• A = πr^2

• A = 0.5πr^2

If the radius of a circle is 5 cm, what is its area?

• 10π cm^2

• 20π cm^2

• 30π cm^2

• 25π cm^2

What is the area of a circle with a diameter of 12 cm?

• 72π cm^2

• 24π cm^2

• 48π cm^2

• 36π cm^2

If the circumference of a circle is 36π cm, what is its area?

• 648π cm^2

• 180π cm^2

• 72π cm^2

• 324π cm^2

What is the area of a circle with a radius of 8 meters?

• 64π square meters

• 32π square meters

• 16π square meters

• 128π square meters

If the area of a circle is 154 cm², what is its radius?

• 12 cm

• 10 cm

• 5 cm

• 7 cm

What is the area of a circle with a circumference of 30 cm?

• 62.78 cm^2

• 28.71 cm^2

• 45.36 cm^2

• 71.45 cm^2

If the diameter of a circle is 14 cm, what is its area?

• 36π cm^2

• 98π cm^2

• 49π cm^2

• 28π cm^2

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

• The area of a circle is constant regardless of the radius.

• The area of a circle is directly proportional to its diameter.

• The area of a circle is inversely proportional to the square of its radius.

• The area of a circle is directly proportional to the square of its radius.

Calculate the area of a circle with a radius of 10 cm.

• 50π cm^2

• 100π cm^2

• 75π cm^2

• 200π cm^2