Diketahui sebuah kerucut dengan luas alas kerucut 1386 cm². Jika tinggi kerucut tersebut 28 cm dan phi 22/7 berapa luas permukaan kerucut
Reree11
Dik :- luas alas / diameter / d = 1386 cm2 - tinggi /t = 28 cm - phi = 22/7 - jari2/ r = d ÷ 2 = 1386 ÷2 = 693 cm - s = s2 = t2 × r2 s2 = 28 × 28 × 693 × 693 s2 = 376.515.216 s = ✅376.515.216 s = 19.404 Dit : luas permukaan kerucut
jawab
luas permukaan kerucut = (phi×r×s) + ( phi×r2) = (22/7×693×19.404) + (22/7×693×693) = 42.261.912 + 1.509. 354 = 43.771.266 cm2
- tinggi /t = 28 cm
- phi = 22/7
- jari2/ r = d ÷ 2 = 1386 ÷2 = 693 cm
- s = s2 = t2 × r2
s2 = 28 × 28 × 693 × 693
s2 = 376.515.216
s = ✅376.515.216
s = 19.404
Dit : luas permukaan kerucut
jawab
luas permukaan kerucut = (phi×r×s) + ( phi×r2)
= (22/7×693×19.404)
+ (22/7×693×693)
= 42.261.912 + 1.509.
354
= 43.771.266 cm2