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d kerucut = 30 cm → r = 30/2 = 15 cm
s kerucut = 25 cm
π = 3,14
tanya
a. lp kerucut
b. volume kerucut
- jawab A (lp kerucut)
πr (r + s)
3,14 • 15 (15 + 25)
3,14 • 15 • 40
1.884 cm
jadi, luas permukaan kerucut = 1.884 cm²
- jawab B (v kerucut)
t² = √s²- r²
= √25² - 15²
= √625 - 225
= √400
= 20
mencari v kerucut
⅓• πr²t
1/3 • 3,14 • 15 • 15 • 20
3,14 • 15 • 5 • 20
4710 cm³
jadi, volume kerucut = 4170 cm³
teliti lagi