Jawab:

30 cm (A)

Penjelasan dengan langkah-langkah:

Keliling = 50 cm
a = x+3y+5
b = 3x+y+1
c = 2x+5y+2

Dicari jumlah panjang sisi

a+b+c = Keliling
x+3y+5+3x+y+1+2x+5y+2 = 50
6x+9y+8 = 50
6x+9y = 50 - 8
6x+9y = 42
2x+3y = 14

a = b
x+3y+5 = 3x+y+1
3x-x+y-3y = 5-1
2x-2y = 4
x-y = 2

maka didapati
2x + 3y = 14
x - y = 2 --> y = x-2

2x + 3(x-2) = 14
2x + 3x - 6 = 14
5x = 14 + 6
5x = 20
x = 4

y = x - 2 = 4 - 2
y = 2

Maka panjang sisi siku-siku =
2(x + 3y + 5) =
2(4 + 3(2) + 5) =
2(4+6+5) =
2(15) =
30 cm (A)

<(7o7)>