Question

the perimeter of halfcircle whose diameter is 21

Answer 1

Diameter=21cm

Circumference of semi circle=

π*d*1/2

22/7*21*1/2=33cm+diameter=33+21cm=54 cm

Therefore the circumference of the semi circle is 54 cm

Hope it helps pls mark as brainliest answer......

Answer 2

Answer:

Step-by-step explanation:

C = 2 *  π * r