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R = 28cm, r = 14 cm
s = 27cm,
misal
S = (27 + a) cm
14(27 + a) = 27 · 28
378 + 14a = 756
14a = 756 - 387
14a = 378
a = 27cm
maka S = 27 + a = 27 +27 = 54cm
L permukaan mangkok bagian luar
= πr² + π(RS - rs)
= (22/7) (14)² + (22/7)((28)(54) - (14)(27))
= 616 + 3564
= 4180cm²