Circles Quiz

An angle whose vertex is the center of a circle is a(n) ______.

• inscribed angle
• acute angle
• obtuse angle
• central angle

What is the radius of this circle?

• 18 in
• 36 in
• 9 in

The homeowners association wants to enclose the playground in a fence. How much fencing is needed?
Is this question finding the area or the circumference?

• area
• circumference
• neither

What is the name of the line that goes from one end of the circle to the other and crosses the center point?

• Area
• Diameter
• Circumference
• Radius

The radius is....

• a line that crosses through the center and touches each edge 
• the center point of a circle 
• a line from the center point to the edge of the circle
• an element in science

Find the area of the circle.

• 28.27 cm²

• 113.09 cm²

• 9.42 cm²

• 7.07 cm²

_{Find the Circumference.}

• 21.42 in

• 31.42 in

• 78.54 in

• 7.85 in

A circular swimming pool is 21 feet in diameter.
How many feet around is the pool? Round to the nearest hundredth!

• 32.99 ft
• 42 ft
• 65.97 ft
• 131.95 ft

If the word problem is asking you to find the space inside the circle, which formula should you use?

• r = d/2
• d = 2r
• C = πd
• A = πr²

If the problem ask you to find the distance around a circle, which formula should you use?

• r = d/2
• d = 2r
• C = πd
• A = πr²