Chapter 9 test Flashcards
1
Q
What is diameter?
A
Diameter is the distance across the circle through the center
2
Q
What is radius?
A
Radius is the distance from the center to any point on the circle
3
Q
What is the formula for diameter?
A
d=2r
4
Q
What is the formula for radius?
A
r=d/2
5
Q
What is circumference?
A
The amount around the entire circle
6
Q
What is the formula for circumference?
A
2 x pi x radius OR pi x diameter
7
Q
What is the formula for finding the permimiter of a semicircle?
A
2
8
Q
If you are given the radius for a semi circle instead of diameter, what do you do?
A
Multiply the radius by 2, if given diameter instead of diameter, divide by 2
9
Q
What is the fomula to find the area of a circle?
A
pi x r^2
10
Q
What is the formula to find the area of a semicircle?
A
2
