Circle Terminology and Formulas Quiz

Which term is defined as "the line segment that goes from the center to the edge of the circle"?

• Radius

• Diameter

• Circumference

• Area

Which term is defined as "the line segment that goes from the edge to the edge and through the center of the circle"?

• Radius

• Diameter

• Circumference

• Area

If the diameter of a circle is 10 cm, what is the circumference using the formula 2πr?

• 10π cm

• 20π cm

• 5π cm

• 15π cm

If the radius of a circle is 7 inches, what is the diameter?

• 14 in

• 7 in

• 21 in

• 3.5 in

A circle has a radius of 7 inches. What is its circumference? (Use 3.14 for pi)

• 43.96 in

• 21.98 in

• 14 in

• 49 in

What is the formula for the perimeter of a semicircle with diameter d?

• πd + d/2

• (πd)/2 + d

• πd

• (πd)/2

If a circle has a radius of 11 ft, what is its area? (Use π ≈ 3.14)

• 121 ft²

• 380.13 ft²

• 76.96 ft²

• 190.5 ft²

What is the formula for the area of a semicircle with radius r?

• πr²

• (πr²)/2

• 2πr

• πr

Find the area of a semicircle with diameter 7 cm. (Use π ≈ 3.14)

• 19.25 cm²

• 38.5 cm²

• 12.25 cm²

• 77 cm²

A student finds the area of a semicircle by calculating πr². What mistake did the student make?

• They used the wrong value for π

• They forgot to divide by 2

• They used the diameter instead of the radius

• They multiplied by 2 instead of dividing