tolong ya pakai cara nya

3/2 x 22/7 x r^2 + r^2 = 200
33/7 x r^2 + r^2 = 200
40/7 x r^2 = 200
r^2 = 200 : 40 x 7
r^2 = 5 x 7 = 35 cm

sorry kalau salah ya hehe