Question

Find the perimeter of a protractor whose diameter is 25 cm

Answer 1

perimeter = circumference
circumference of a circle = 2 pi r
circumference of a semicircle = 2 pi r / 2
                                                = pi r
As we know that protractor is a semicircle 
So circumference of protractor is
 =pi r + the diameter
 =(3.14 x 12.5) + 25
 = 39.25 + 25
  = 64.25 cm

Hope this is what you expected
Don't forget to mark this answer as brainest