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Ane mulai dari nomer 2 ya :)
Dik: V = 198
t = 7
Rumus volume = π . r² . t
Dit : a. r = ?
b. L.s = ?
c. L.p = ?
Penyelesaian
a. V = π . r² . t
⇒198 = 22/7 . r² . 7
⇒198 = 22 . r²
⇒198/22 = r²
⇒r² = 198/22
⇒r² = 9
⇒r = √9
⇒r = 3
b. L.s = keliling lingkaran × tinggi
⇒L.s = π . d . t
⇒L.s = 22/7 . 6 . 7
⇒L.s = 22 . 6
⇒L.s = 132
c. L.p = Luas selimut + alas + tutup
⇒L.p = 132 + 2 . 3,14 . 3 . 3
⇒L.p = 132 + 56,52
⇒L.p = 188,52