Question

The figure is made up of two shapes, a semicircle and a rectangle.What is the exact perimeter of the figure?

Answer 1

Perimeter of circular area = πr = 3.14 * 10 = 31.4 mm

Perimeter of rectangular area = 30 + 20 + 30 = 80 mm

Total Perimeter = 80 + 31.4 = 111.4

In short, Your Answer would be 111.4 mm

Hope this helps!

Answer 2

Perimeter of a rectangle =2(w+l)=2(50)=100mm

perimeter of a semicircle =circumference of a semicircle=2π2/2=2π*10/2

here d=20 so r=d/2=10mm

perimeter of a semicircle=10πmm=31.4 mm

perimeter of a whole fig is 31.4+100=131.4mm