Question

Find the radian measure of interior angle of a regular pentagon

Answer 1

Each int. angle of pentagon = [(5-2) x 180]/5

                                              = 3 x 36 = 108°

∵  180°   =   π radian

∴ 1°     =  π / 180  '' ''

∴ 108 °  = π /180 × 108 =  3π /5  radian

OK

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