tolong pakai cara nya kak 9 sama 10
Jawaban:
9) Lp tabung :
Lp = 2πr(r + t)
= 2 × 22/7 × 14 ×(14 +24)
= 88 × 38
= 3.344 cm³
Lp bola (½)
Lp = 4πr²
= 4 × 22/7 × 14²
= 4 × 22/7 × 196
= 4 × 22 × 28
= 2.464 cm³ (½)
= 1.232 cm³
jumlah luas permukaan --> 3.344 + 1.232 = 4.576 cm³
10) Lp tabung :
Lp = 2πr(r + t)
= 2 × 22/7 × 14 ×(14 +10)
= 88 × 24
= 2.112 cm³
Lp balok:
Lp = 2 × [ (pl + pt + lt) ]
= 2 × [ ( 14 × 14) + ( 14 × 20) + (20 × 14) ]
= 2 × (196 + 280 + 280)
= 2 × 756
= 1.512 cm³
Lp kerucut :
Lp = πr(r + s)
= 22/7 × 14 ×(14 + 15)
= 44 × 29
= 1.276 cm³
jumlah luas permukaan --> 2.112 + 1.512 + 1.276 = 4.900 cm³
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