Download Geometry Notes on Arcs (Section 7.6) Definitions: 1.) circle

Geometry
Notes on Arcs (Section 7.6)
Definitions:
1.) circle- set of all points in a plane that are _________________ from a fixed point called the ___________.
2.) radius – a line segment from the ___________ of a circle to the side of the circle.
3.) diameter – A line segment through the _______________ with both endpoints on the circle.
4.) central angle – An angle with its ____________ at the center of a circle.
5.) semi-circle - ___________ of a circle.
6.) minor arc – an arc that is _____________ than a semi-circle.
7.) major arc – an arc that is ______________ than a semi-cirlce.
Example #1:
A
Name the central angle: ____________
C
Name a minor arc: ________________
D
Name a major arc: _______________
B
Arcs have degree measures and lengths.
Finding arc degree measures
Degree measure of arc = degree measure of central angle
Example #2:
Find the following measures:
A
B
D
C
Example #3:
A
B
Find the following measures:
50°
E
D
Finding arc length
Circumference of a circle is the distance around the outside (it’s perimeter) the formula is
Example #4:
Find the arc lengths for the circle above if AE = 5
C