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242 = pi × d
242 = 22/7 × d
d = 242 × 7/22 (dibalik karna dibagi)
d = 77 cm
r = d/2 = 77/2 = 38,5
luas = pi × R²
luas = 22/7 × 38,5²
luas= 4658,5 cm²
caranya..
K = X d
L = x r x r
K= 22/7 x d
242=22/7 x 77
r = 77/2 ~> 38,5
L= 22/7 x 38,5 x 38,5
= 4658,5
maaf kalo bertele-tele dan susah dipahami^^