Circle Properties and Formulas

If a circle has a diameter of 14 units, what is its radius?

• 7 units

• 14 units

• 28 units

• 3.5 units

A circle has a diameter of 6 inches. What is the length of its radius?

• 12 inches

• 6 inches

• 3 inches

• 9 inches

What is the correct formula to find the area of a circle?

• A = 2πr

• A = πd

• A = πr²

• A = d/2

What is the area of a circle with a radius of 3 inches?

• 6π square inches

• 9π square inches

• 36π square inches

• 12π square inches