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2156 = 1/3 22/7 . r² . 10,5
2156 = 22/21 . r² . 10,5
2156 . 21 = 231 . r²
45276 = 231 r²
r² = 45276/231
r² = 196
r = √196
r = 14 cm
s = √(t² + r²)
s = √(10,5² + 14²)
s = √110,25 + 196
s = 17,5 cm
Luas Permukaan:
= phi . r (r + s)
= 22/7 . 14 (14 + 17,5)
= 44 (31,5)
= 1386 cm²