3. Permutations and Combinations
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150 ^(∘)
An arc is a portion of a circle defined by two endpoints. A central angle separates the circle into two arcs, the major arc and the minor arc. The measures of these arcs are related to the measure of the central angle.
Arc | Measure |
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A minor arc is the shortest arc connecting two endpoints on a circle. | The measure is less than 180^(∘) and is equal to the measure of its related central angle.
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A major arc is the longest arc connecting two endpoints on a circle. | The measure is greater than 180^(∘) and is equal to 360^(∘) minus the measure of the minor arc with the same endpoints.
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mADB= 210
LHS+mAB=RHS+mAB
LHS-210=RHS-210