PERIMETER 2

Find perimeter of a regular polygon with 5 sides inscribed in a circle of radius 8cm.

Solution

P = 2nrSin(180⁰/n)

n= 5 sides and r=8cm

P = 2 x 5 x 8 x Sin(180⁰/5)

P = 80 x Sin36⁰

P = 80 x 0.5878

Hence P = 47.024cm

TRY THIS…………….. 

Find perimeter of a regular polygon with 12 sides inscribed in a circle of radius 5cm.