Terms
The distance from the center of a circle to edge, also half of the diameter.
radius
radius = 5 in
diameter = ?
10 in
What is the circumference if the diameter is 7 ft?
21.98 ft
diameter = 12 in
radius = ?
6 in
What real-life circle is made with dough, sauce, toppings, and cheese?
pizza
The distance from one point on a circle through the center to another point on a circle, also twice the radius.
diameter
radius = 10 cm
diameter = ?
20 cm
What is the circumference if the diameter is 10 in?
31.4 in
diameter = 26 ft
radius = ?
13 ft
If Circle A has a radius of 5 cm and Circle B has a radius of 12 cm ...
Circle A needs to be ___________ to match Circle B.
enlarged
The distance around a circle.
circumference
radius = 42 km
diameter = ?
84 km
What is the circumference if the radius is 2 cm?
12.56 cm
diameter = 45 cm
radius = ?
22.5 cm
If Circle K has a diameter of 25 in and Circle L has a diameter of 18 in ...
Circle K needs to be ___________ to match Circle L.
reduced
How is a circle named?
by the center point
radius = 12.5 mm
diameter = ?
25 mm
What is the circumference if the radius is 29 mm?
182.12 mm
diameter = 3 mm
radius = ?
1.5 mm
An angle whose vertex is at the center of a circle
central angle
The value of pi.
3.14
radius = 235 in
diameter = ?
470 in
What is the circumference if the diameter is 14.9 km?
46.786 km
diameter = 156 km
radius = ?
78 km
A line segment passing through a circle that has its endpoints on that circle
chord