FIND THE RADIUS OF SEMICIRCLE IF ITS PERIMETER IS 18 cm Share with your friends Share 3 Priyanka Kedia answered this We know that,Perimeter of semicircle=Diameter+2πr2⇒18=2r+πr⇒18=r2+227⇒18=r14+227⇒18=r367⇒r=18×736⇒r=3.5 cmHence, radius of semicircle is 3.5 cm. 11 View Full Answer Hari Gautam answered this 3.5 cm 4 Shravani Chinni answered this hey man how did u get that , explain? answer is absolutely right!! 0 Shravani Chinni answered this fast urgent plzz tell me how got the answer? 0