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t = 10cm
Dit. La?
Jawab : V = 1 × ×d²×t
4
1540 = 1 × 22 × d² × 10cm
4 7
1540 = 22 × d² × 10cm
4 × 7
d² = 1540×4×7
22 × 10
d² = 43120
220
d² = √196
d = 14cm -> r = 7cm
Luas alas = × r²
= 22 × 7 × 7
7
= 154cm²
2. Dik. V = 3080cm³
La = 154 cm²
Dit. t?
Jawab : La = × r²
154 = 22 × r²
7
r² = 154 × 7
22
r² = √49
r = 7cm -> d = 14cm
V = 1 × × d² × t
4
3080 = 1 × 22 × 14 × 14 × t
4 7
3080 = 22 × 14 × 14 × t
4 × 7
t = 3080 × 4 × 7
22 × 14 × 14
t = 86240
4312
t = 20cm