Question

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

Answer 1

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

Answer 2

The approximate perimeter of a semi circle with diameter of 12cm is 18.84 cm.

Perimeter :

Perimeter is the sum of the whole sides of a figure. Therefore,

Perimeter of a semi circle = πr

where

r = radius

Therefore,

diameter  =12 cm

r = 12 / 2 = 6 cm

Therefore,

perimeter = πr

perimeter = 3.14 × 6

perimeter = 18.84 cm

learn more on semi circle here: https://brainly.com/question/3070344