Vocabulary
Radius from Diameter
Diameter from Radius
Circumference
Area of a Circle
100
A round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center)
A circle
100
How do you find the radius of a circle when given the diameter?
divide the diameter by 2
100
How do you find the diameter of a circle when given the radius?
multiply the radius times 2
100
What is the formula for finding the circumference of a circle?
100
What is the formula for finding area of a circle?
200
A straight line from the center to the circumference of a circle
Radius
200
What is the radius of a circle that has an 8-foot diameter?
4 ft.
200
What is the diameter of a circle with a radius of 5 inches?
10 inches
200
Find the circumference of this circle when pi=3
84 m.
200
Find the area of this circle when pi = 3
588 m.
300
A straight line passing from side to side through the center of a circle
Diameter
300
What is the radius of this circle? 
6 cm.
300
What is the diameter of a circle with a radius of 100 feet?
200 ft.
300
What is the circumference of a circle with a radius of 6 inches when pi = 3.14?
37.68 inches
300
What is the area of a circle with a radius of 5.5 inches when pi = 3.14?
94.985 inches
400
the distance around the circle. It is the circle's perimeter
circumference
400
What is the radius of this circle? 
3.1 mm
400
What is the diameter of this circle? 
28 m
400
What is the circumference of this circle when pi = 3.14? 
28.26 in.
400
What is the area of this circle 
when pi = 3.14?
28.26 in.
500
The amount of space inside the boundary of a flat (2-dimensional) object such as a triangle or circle
Area
500
What is the radius of a circle that has a 325-foot diameter?
162.5 ft.
500
What is the diameter of a circle with a radius of 215 inches?
430 in.
500
What is the circumference of this circle when pi = 3.14? 
19.468 mm
500
What is the area of this circle when pi = 3.14? 
30.1754 mm