Tolong bantuin saya please soalnya udah tengah malam
Jawaban Terkonfirmasi
BRSD
1][ balok
p = 2x + 3
l = 3x
t = 2x -3
Lp = __ ?
Lp = 2 (p·l + p·t + l·t)
Lp = 2 [(2x + 3)(3x) + (2x + 3) (2x – 3) + 3x (2x – 3)]
Lp = 2 [6x² + 9x + 4x² – 9 + 6x² – 9x]
Lp = 2 [16x² – 9]
Lp = (32x² – 18) cm² ← jwb [c]
2][ prisma segitiga siku-siku
s1 = 5, s2 = 12, s3 = 13
t = 20
Lp = __ ?
Lp = 2 La + K t
Lp = 2 (5×12 / 2) + (5 + 12 + 13) · 20
Lp = 2 (30) + (30) · 20
Lp = 60 + 600
Lp = 660 cm² ← jwb [b]
2. 2x(5×12:2) + 5+12+13 x 20
60 + 30×20
60 + 600
= 660 cm B