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R = d : 2 = 28 : 2 = 14
Kll = phi x d = 22/7 x 28 = 88
L = phi x r x r = 22/7 x 14 x 14 = 44 x 14 = 616
Semoga membantu :)
d = d : 2
r? = 14 (karena jarijari setengahnya diameter)
kll? π. d2
L? 1/4 . π . d
jawaban :
r? 28 : 2 = 14
kll? 22/7 . 28 . 28 = 2464
L? 1/4 . 22/7 . 28 = 22