Question

Find the circumference of a circle with radius 15.4 cm and the perimeter of the two semicircle with the same radius.

Answer 1

circumference of circle is..
$2\pi \: r$
The circumference will be... 96.8

Answer 2

Try using formula 2πr where π=22/7 and r is the radius this formula is for the circumference of circle
And for semicircle find the circumference and divide by 2+ radius *2 try it yourself it is improve u don't at anybody answer u will get for sometime and then u will forget but if u try yourself u will remember forever
Hope u got it