Question

one angle of a decagon is 153° and all other nine angles are equal. what is the measure of each equal angle?

Answer 1

the measure of each equal angle is143°.

Answer 2

Total angle measure of a decagon is = 1440°
One angle = 153 °
All angles are equal
So lets take them as x
Sum of all angles = 9x
1440 = 153 + 9x
1287 = 9x
x = 143 °


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