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Verified answer
Mapel : MatematikaBab : Bangun Ruang Sisi Lengkung
S - A = 28 cm²
S + A = 336 cm²
----------------------- -
-2A = -308 cm²
A = -308 cm²/-2
A = 154 cm²
Luas alas = π x r²
154 cm² = 22/7 x r²
r² = 154 x 7/22
r² = 49
r = √49
r = 7 cm
S + A = 336
--------------------(-)
-2A = -308
A = 154 cm
S - (-154) = 28
S + 154 = 28
S = 182 cm
Luas = r²
154 = 22/7 x r²
154 x 7/22 = r²
49 = r²
r = 7 cm
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