Vocabulary
Radius
A radius is a straight line that goes from the exact center of a circle or sphere to its outer edge.
A circle has a radius of 5 cm. Find the circumference. (Use 3.14 for pi).
31.4159 cm
72 / 8 = ?
9
52 - 12 = ?
40
What is the slope in the following equation?
y = -4x + 1
Slope = -4
Diameter
The diameter is the straight line that passes through the exact center of a circle or sphere, connecting two points on its edge.
A circle has a diameter of 14 in. Find the area. (Use 3.14 for pi).
153.938 in2
144 / 12 = ?
12
3 - 9 = ?
-6
True or False:
Two things are proportional when the relationship between them changes.
False. Relationship
Two dimensional area enclosed by a circle.
A circular garden has a radius of 9 ft. Find both the area and the circumference. (Round to the nearest tenth if needed.)
Circumference = 56.5487 ft
Area = 254.469 ft2
2048 / 8 = ?
256
-71+(-16) = ?
-87
Solve the following equation for x:
x/3 - 7 = 4
x = 33
Circumference
The circumference of a circle is the total distance around its outside boundary.
A circle has a diameter of 10 cm. Find both the area and the circumference.
Circumference = 31.4159 cm
Area = 78.5398 cm2
7980 / 7 = ?
1140
72-(-11) = ?
83
Solve the following equation for x:
5x + 22 = -2x + 36
x = 2
Pi
Pi is a special mathematical number. It represents the ratio of any circle's distance around its edge (circumference) to its distance across the middle (diameter).
A circle has a radius of 12 m. Find both the area and the circumference.
Circumference = 75.3982 m
Area = 452.389 m2
14245 / 14 = ?
1017.5
17-(-3)+18 = ?
38
Mia wants to put a ribbon around the edge of a circular cake that has a diameter of 11 inches. How much ribbon does she need to go all the way around?
34.5575 inches