Math Quiz: Circumference and Area

What is the formula for the circumference of a circle?

• C = 2πr

• C = 2πd

• C = πr²

• C = πd

What is the formula for the area of a circle?

• A = πd

• A = 2πd

• A = πr²

• A = 2πr

What is the ratio of the circumference to the diameter of a circle?

• Circumference * Diameter

• Diameter/Circumference

• Circumference/Diameter

• Circumference + Diameter

When solving problems with circles, what are the three ways to write your answer?

• Using 3.14 as pi and multiply

• Using the pi key on your calculator and multiply

• Using 3.14 as pi and divide

• Using the pi key on your calculator and add

What is the area of 4 congruent circles if the cloth is 20 inches wide?

• A) 4π(10)², B) 4π(5)²

• A) 4π(25)², B) 4π(15)²

• A) 4π(15)², B) 4π(5)²

• A) 4π(20)², B) 4π(10)²

What is the area of the circular window with a diameter of 6 meters?

• B) 12π m²

• D) 36π m²

• A) 9π m²

• C) 18π m²

If you buy 5 circular rugs, each with a radius of 6 inches, what will be the area covered by the rugs?

• B) 36π in²

• A) 30π in²

• C) 60π in²

• D) 72π in²

Explain and illustrate why a diameter is a chord but a radius is not.

• D) A diameter is a straight line that passes through the center of the circle, while a radius is a straight line that passes through the center of the circle.

• C) A diameter is a line segment from the center to a point on the circle, while a radius is a line segment from the center to a point on the circle.

• B) A diameter is a line segment from the center to a point on the circle, while a radius is a straight line that passes through the center of the circle.

• A) A diameter is a straight line that passes through the center of the circle, while a radius is a line segment from the center to a point on the circle.