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A full circle is 360°.

Divide the full circle into five congruent parts or arcs formed by 5 distinct points on a circle.

360 ° ÷ 5 = 72 °

Each arc has 72 degrees in measure.
Each central angle that intercepts the arc is also 72° in measure.

To convert degree measure to radians:

Degree measure ×  π      = radian

72 ° x   π    = radian

= 72/180 radian  or 2/5 radians