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We know that perimeter of a complete circle = 2πr, where r is the radius of the circle.

So, perimeter of semi-circle = πr

Given: Diameter of semi-circle = 10 cm
 


Therefore, 

radius of the given circle = 5 cm

Now, 

Perimeter of semi-circle = Perimeter of semi circular part + Length of AB

                                   = 5Π + 10

                                   = ( 3.15× 5) + 10

                                    



= 15.7 + 10

= 25. 7 cm



Total perimeter = 25.7 cm