Question

neha divides a circular disc of radius 4.2 cm into two rqual parts .find the perimeter of each semicircle​

Answer 1

Answer:

21.588cm

Step-by-step explanation:

A semicircle is half of a circle+ Its diameter

Radius= 4.2cm

Diameter= 4.2×2=8.4cm

Circumference=πd

                        = 3.14×8.4

                        = 26.376cm

Half of 26.376= 13.188cm

13.188cm+8.4cm(Diameter)= 21.588cm

Therefore, perimeter of each semicircle is 21.588cm