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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