Question

What is the best approximation for the perimeter of a semicircle with a diameter of 35 inches?

Use 3.14 to approximate pi.


54.95 in.

89.95 in.

109.90 in.

144.90 in.

Answer 1

Perimeter of a semicircle = (1/2)(pi)(d) + d

Answer 2

perimeter of a circle = 2pi*r = 2pi*(d/2) = pi*d

perimeter of a semicircle = (perimeter of a circle) / 2 = pi *d /2

@Vocaloid excuse me - why is this (+d) ?

Answer 3

I’m on my phone so I can’t draw it

But if you draw a half circle you have to include the flat part of the circle which adds the extra d

Answer 4

ok ty so much - i understand it now - there is the perimeter halfed and the diameter ok

ty so much