Radius
Diameter
Word Problems
Circumference
Area
100
How do you find the radius of a circle?
Diameter/2
Circumference/2 pi
100
How do you find the diameter of a circle?
2 * Radius
100
A circular garden has a radius of 5 meters. What is the area of the garden? (Use π ≈ 3.14 and round to the nearest hundredth)
78.54m2
100
How do you find the circumference of a circle?
2pi * Radius
100
How do you find the area of a circle?
pi * Radius2
200
The bottom diameter of a bottle of water is 4 in. What is half of that?
2 in.
200
Find the diameter of the picture below.
13
200
A pizza has a diameter of 12 inches. What is the radius of the pizza?
6 in.
200
#1 ONLY
9.42m
200
#1 ONLY in terms of pi 
12.25pi
300
The diameter of a circle is 3.78 ft. What is the radius?
1.89 ft.
300
My pan has a radius of 6 in. What is the diameter?
12 in.
300
The bottom circumference of a circular vase is 8 in. What is the radius? Round to the nearest hundredth.
1.27 in.
300
#2 ONLY
56.55 cm.
300
#2 ONLY in terms of pi
25pi
400
Pluto's diameter is around 1,476.8 miles. How much is half of that?
738.38 miles
400
A circle's radius is 5.36 in. What is the diameter?
10.72 in.
400
A pan has a radius of 3 in. What is the area? Round to the nearest hundredth.
28.27 in2
400
#3 ONLY
2.512m
400
#3 ONLY in pi terms
12 in.
500
Find the radius of the figure shown. Round to the nearest tenth.
1.27 meters
500
The sun's radius is around 432,690 miles. How big is it's diameter?
865,370 miles
500
How is the circumference and area of a circle different? (Both formula and visual difference)
The area of a circle is found by pi*radius2 and is the inside of the circle.
The circumference is 2pi*radius and is the perimeter of the circle (outside).
500
The diameter of the bottom of that vase is 4.5 in. What is its circumference? Round to the nearest hundredth.
14.14 in.
500
A circular pond has a radius 2 yards. What is the area?
12.56 yards2