The sum of seven of an angle of a decagon is 11700. The other three angles are all equal to each other. Calculate the sizes of the other three angles.
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Step-by-step explanation:
you must be describing internal angles , since the sum of the external angle is always 360 degrees.
the sum of the internal angles of an n sided figure is 180*n-20, so for a decagon it equals
10-2*180 = 8*180=1440 degrees
since 7 of the angles = 1170 , the final three angle equals
1440 - 1170 = 270
since these three angles are equal each angle = 270/30 = 90 degrees
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