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

just confirming that the answer is 30.84.

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