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CIRCLES!
An arc is when you have 2 points on a circle and you figure out the degree measure of them.
For example, If the perimeter of the circle is 120 units and arc AB is 30 units long, then 30 / 120= 0.25. Then you can multiply 0.25 * 360 degrees, which gives you 90.
A
B
B
Angle ACB = (Arc AB) / 2
A
C
B
D
Angle AEB = Angle DEC = [ (Arc AB) + (Arc CD) ] / 2
E
A
C
B
Z
Angle Z = { (Arc A) - (Arc B) } / 2
A
Angle (ZAB) = { Arc (AB) - Arc (BC) } / 2
Z
A
B
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