Tolong kak gimana caranya besok harus dikumpulin
Penjelasan dengan langkah-langkah:
No 1
Berburu lengkung langit segitiga sama ialah :
tepi langit² = BC² – (1/2 x AB)²
kaki langit² = 8² – (1/2 x 12)²
horizon² = 8² – 6²
kaki langit² = 64 – 36
tepi langit² = 28
t = √28 = 2√7 cm
L alas = L tutup = 1/2 x a x kaki langit
= 1/2 x AB x t segitiga
= 1/2 x 12 x 2√7
= 6√7 cm²
L persegi panjang ABED = p x l
= AB x EB
= 12 x 10
= 120 cm²
L ACFD = L BCFE = p x l
= AC x AD
= 8 x 10
= 80 cm²
L parasan prisma yaitu:
L = L alas + L tutup + L ABED + L ACFD + L BCFE
= 6√7 + 6√7 + 120 + 80 + 80
= 280 + 12√7 cm²
No
2
Mencari panjang BC adalah :
BC² = AC² + AB²
BC² = 5² + 12²
BC² = 25 + 144
BC² = 169
BC = √169 = 13 cm
L wana = L tutup = 1/2 x a x t
= 1/2 x AB x AC
= 1/2 x 12 x 5
= 30 cm²
L persegi panjang ABED = p x l
= AB x BE
= 12 x 14
= 168 cm²
L persegi panjang BCFE = p x l
= BC x BE
= 13 x 14
= 182 cm²
L persegi tataran ADFC = p x l
= AC x AD
= 5 x 14
= 70 cm²
L meres prisma yakni:
L = L wana + L tutup + L ABED + L BCFE + L ADFC
= 30 + 30 + 168 + 182 + 70
= 480 cm²
No
3
Mencari t segitiga sama kaki yaitu :
lengkung langit² = TC² – (1/2 x BC)²
horizon² = 8² – (1/2 x 12)²
ufuk² = 8² – 6²
lengkung langit² = 64 – 36
t² = 28
horizon = √28 = 2√7 cm
L limas = L rimba + L sisi tegak
L limas = L ABCD + (4 x TBC)
= 12² + (4 x 1/2 x 12 x 2√7)
= 144 + 48√7 cm²
Mohon dikoreksi kembali /\
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