Jawab:
Penjelasan dengan langkah-langkah:
bangun ruang
soal 3
Kerucut
s= 14
luas permukaan = 220
π r² + π r s= 220
π(r² + rs)= 220
r² + rs = 220/π
r² + 14 r = 70
(r + 7)² = 70 + 49
(r + 7) = ± √119
r = 7 + √119
soal 4
Luas kap lampu=
= Luas selimut besar - luas selimut kecil
= π R S - π r s
= π (15)(12+30) - π( 10)(12)
= π (15)(42) - π(10)(12)
= π(630 - 120)
= π (510)
= (3,14)(510) = 1.601, 4 cm²
soal 5
r = 3 cm
t kerucut = 4 ,
s kerucut= √(3²+4²) = 5
t tabung = 10
Luas bangun = LB
LB = luas tabung tanpa tutup+ luas selimut kerucut
LB = πr² + 2 π r T + π r s
LB = π r ( r + 2 t + s)
LB = π (3) (3 + 20 + 5)
LB = 3π (28)
LB = 3 x 22/7 x 28 = 264 cm²
LB = luas tabung tanpa tutup + luas selimut kerucut
LB = n (3) (3 + 20 + 5)
LB = 3n (28)
semoga bermanfat ya kakak semnagt belajar ya
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Jawab:
Penjelasan dengan langkah-langkah:
bangun ruang
soal 3
Kerucut
s= 14
luas permukaan = 220
π r² + π r s= 220
π(r² + rs)= 220
r² + rs = 220/π
r² + 14 r = 70
(r + 7)² = 70 + 49
(r + 7) = ± √119
r = 7 + √119
soal 4
Luas kap lampu=
= Luas selimut besar - luas selimut kecil
= π R S - π r s
= π (15)(12+30) - π( 10)(12)
= π (15)(42) - π(10)(12)
= π(630 - 120)
= π (510)
= (3,14)(510) = 1.601, 4 cm²
soal 5
r = 3 cm
t kerucut = 4 ,
s kerucut= √(3²+4²) = 5
t tabung = 10
Luas bangun = LB
LB = luas tabung tanpa tutup+ luas selimut kerucut
LB = πr² + 2 π r T + π r s
LB = π r ( r + 2 t + s)
LB = π (3) (3 + 20 + 5)
LB = 3π (28)
LB = 3 x 22/7 x 28 = 264 cm²
Jawab:
luas permukaan = 220
π r² + π r s= 220
π(r² + rs)= 220
r² + rs = 220/π
r² + 14 r = 70
(r + 7)² = 70 + 49
(r + 7) = ± √119
r = 7 + √119
soal 4
Luas kap lampu=
= Luas selimut besar - luas selimut kecil
= π R S - π r s
= π (15)(12+30) - π( 10)(12)
= π (15)(42) - π(10)(12)
= π(630 - 120)
= π (510)
= (3,14)(510) = 1.601, 4 cm²
soal 5
r = 3 cm
t kerucut = 4 ,
s kerucut= √(3²+4²) = 5
t tabung = 10
Luas bangun = LB
LB = luas tabung tanpa tutup + luas selimut kerucut
LB = πr² + 2 π r T + π r s
LB = π r ( r + 2 t + s)
LB = n (3) (3 + 20 + 5)
LB = 3n (28)
LB = 3 x 22/7 x 28 = 264 cm²
semoga bermanfat ya kakak semnagt belajar ya
Penjelasan dengan langkah-langkah: