Jawaban:
a. Luas alas kerucut = 2.826 cm
b. Luas selimut kerucut = 4.710 cm
c. Luas permukaan kerucut = 7.536 cm²
d. Volume kerucut = 37.680 cm³
Penjelasan dan langkah-langkah:
Dik = r : 30 cm
= s : 50 cm
Dit = t : ?
t = √ s²- r²
= √ 50²- 30²
= √ 2.500 - 900
= √ 1.600
= 40
t = 40 cm
Dik = r : 30 cm
= s : 50 cm
= t : 40 cm
a. La = π.r²
= ( 3,14 × 30 ) × 30
= 94,2 × 30
= 2.826 cm
b. Ls = π.r.s
= ( 3,14 × 30 ) × 50
= 94,2 × 50
= 4.710 cm
c. Lp = La + Ls
= π × r × ( r + s )
= 3,14 × 30 × ( 30 + 50 )
= 94,2 × 80
= 7.536 cm²
d. V = 1/3 × π.r².t
= 1/3 × ( 3,14 × 30 ) × 30 × 40
= 94,2 × ( 1/3 × 30 ) × 40
= ( 94,2 × 10 ) × 40
= 942 × 40
= 37.680 cm³
ket:
s = Garis pelukis kerucut
r = Jari jari kerucut
t = Tinggi kerucut
La = Luas alas kerucut
Ls = Luas selimut kerucut
Lp = Luas permukaan kerucut
V = Volume kerucut
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Jadikan jawaban tercerdas!
Jawaban:
dik :
r = 30cm
s = 50cm
Penjelasan dengan langkah-langkah:
a) luas alas kerucut
La = πr²
= 3,14×30×30
= 2.826 cm²
b) luas selimut kerucut
Ls = πrs
= 3,14×30×50
= 4.710 cm²
c) luas permukaan kerucut
Lk = πr(r+s)
= 3,14×30 (30+50)
= 94,2× (80)
= 7.536 cm²
d) tentukan tingginya terlebih dahulu
tinggi kerucut= 50²-30²
= √2.500-900
= √1.600
= √40
= 40 cm
volume kerucut
vk = ⅓πr²t
= ⅓×3,14×30×30×40
= 37.680 cm³
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