How do you calculate the circumference of a half circle?

Answer by  oker (34)

You first have to measure the radius of the circle,then you can calculate the circumference by the formula pi*r where pi is the constant 3.14 , r is the radis.

Answer by  noguf (162)

(pi)x(diameter)/2 + diameter. Use the formula for the circumference of a circle which is pi x diameter (where pi = 3.14159) and diameter is the distance across the circle (along the edge of the half circle). Divide this number by 2 (only half circle) and then add the diameter.

Answer by  keven (20)

Circumference of a half circle would be half of the total circumference plus the diameter, or just half the circumference if you only need the arc length.

Answer by  Angie83 (180)

[(Pi x D)/2]+ D The circumference of a circle is Pi (3.14) times the diameter(D). Then to get the circumference of a half circle you would need to divide by 2 then add the diameter. The diameter is 2 times the radius.