bantuin pakai cara ya kak, soalnya mau dikumpulin besok
Jawab:
2.
Keliling = 2×(panjang + lebar)
30 = 2×(3x-2 + x+3)
15 = 4x + 1
4x = 14
x = 3,5
Panjang = 3x-2
= 3×3,5 - 2
= 8,5 cm
3. Kell ABCD = 2×(panjang + lebar)
= 2×(24+12)
= 72 cm
Kell ABCD = 2 × Kell PQRS
72 = 2 × Kell PQRS
Kell PQRS = 72 ÷ 2
4 × sisi PQRS = 36
sisi PQRS = 36 ÷ 4
= 9 cm
[answer.2.content]
