Parts of a Circle 1
A segment with endpoints at the center and on the circle is the __________.
Radius
If the radius of the circle is 25cm, what is the diameter?
50cm
What is the correct formula for the circumference of a circle?
A. 2piR
B. piD
C. Both
C. Both
How many degrees are in a circle?
360
Look at Picture 4. What is the length of Arc AB and what is the measure of Arc AB in terms of degrees?
Length = 14cm
Measure = 75 degrees
2
How many letters are used to name a major arc?
3
What is the correct formula for the area of a circle?
A. 2piR
B. piR2
C. piD2
D. Rpi2
B. piR2
If a central angle has a measure of 107 degrees, what is the measure of the arc formed by the endpoints of that central angle?
107 degrees
Look at picture 5. What is the measure of Arc ACB in terms of degrees?
260 degrees
A ____________ is an arc with a measure greater than 180 degrees.
Major Arc
A chord that passes through the center of the circle is the ____________.
Diameter
8
Look at Picture 1. What is the measure of Arc BC?
30 degrees
Look at Picture 6. What is the measure of Arc AB in terms of degrees?
55 degrees
A ___________ is a segment with endpoints on the circle.
Chord
A ___________ is an arc with a measure of less than 180 degrees.
Minor Arc
If the radius of a circle is 14cm, what is the formula you would use to find the circumference of the circle?
C=2pi(14)
65 degrees
Look at Picture 6. What is the measure of Arc BC in terms of degrees?
28 degrees
An angle with a vertex at the center of the circle, and two sides that are two radii is called what?
A Central Angle
An arc with endpoints on the diameter is a _________.
Semi-Circle
If the diameter of a circle is 15ft , what is the formula you would use to find the area of the circle?
A=pi(7.5)2
Look at Picture 3. What is the equation you would use to solve for x?
4x + 1 + 13x - 7 = 180
33.8in