Question

If the perimeter of a protector is 108cm.Find it's radius.

Answer 1

D+22/7Xr=108
(Diameter+Arc(1/2 of circumference))=perimeter

2R+22/7R=108
36R/7=108
R=108X7/36
R=21cm.

Answer 2

(Diameter+Arc(1/2 of circumference))=perimeter

2x+22/7x=108
36x/7=108
x=108X7/36
x=21cm.
Therefore rediyo= 21 cm