Terms
Radius and Diameter
Circumference
Area
100
The point from which all points on the circle are the same distance.
What is the center?
100
Identify the radius.
What is A?
100
Identify the circle with the larger circumference. EXPLAIN.
The circle on the right has a larger circumference because the circle's diameter is larger. Circumference is dependent upon diameter in the formula
C=pid
100
The equation for area of a circle.
A=pir^2
200
The line from the circle's perimeter to its center.
What is the radius?
200
Identify ALL possible radii.
What are OD, GD, SD?
200
The equation for the circumference of a circle.
C=2pir or C=pid
200
Calculate the area of the circle. Round to the nearest tenth and use pi notation for your answer. 
What is
A=169pi
inches squared?
300
Any line whose endpoints lie on the perimeter of the circle and passes through the center of the circle.
What is the diameter?
300
The relationship between radius and diameter (formula).
r=d/2
300
The radius of a circle is four inches. Find the circumference. Round to the nearest tenth. Use 3.14 for
pi
What is 25.1 inches?
300
The diameter of a circle is four inches. Calculate the area of the circle. Round to the nearest tenth and use 3.14 for
pi.
What is 12.6 inches squared?
400
The number of square units inside a circle.
What is the area?
400
The diameter of a circle is 16 m long. Calculate the radius.
What is 8m long?
400
Find the circumference of the circle. Round to the nearest tenth and use 3.14 for
pi.
What is 74.1 ft?
400
The diameter of a circle is 27 meters. Identify the area. Do not round your answer and leave the answer in terms of
pi.
What is
182.25pi
500
The distance around the outside of the circle.
What is the circumference?
500
Find the radius. The diameter of a circle is
d=4x
What is
r=2x
?
500
The ferris wheel spins around one time. Identify how far the Jimmy, who is riding in the green cart, travels. Use 3.14 for
pi
. Round to the nearest tenth.
What is 197.8 ft?
500
CHALLENGE PROBLEM: The circumference of a circle is 69.08 feet. Find the area of the circle. Round to the nearest tenth. Use 3.14 for
pi.
What is 379.9 feet squared?