What is the best approximation for the perimeter of a semicircle with a diameter of 12 cm?

Use 3.14 to approximate pi.

18.84 cm

30.84 cm

61.68 cm

75.36 cm

When we speak of the word "perimeter" of a circle, we mean to say the circumference. Since we are only given a semicircle, the perimeter would be,

perimeter = (pi) (radius) + diameter

Substituting the known values,

perimeter = (3.14) (6 cm) + 12 cm

The value of the perimeter is,

perimeter = 30.84 cm