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64 = 2(9x + 7x)
64 = 2 * 16x
64 = 32x
64 / 32 = x
2 = x
panjang = 9x = 9 * 2 = 18
lebar = 7x = 7 * 2 = 14
Luas = p * l
= 18 * 14
= 252 cm^2 (B.)
9 + 7 = 16
Mencari panjang: 9/16 × 64 ÷ 2 (dari rumus Keliling) = 18
Mencari lebar : 7/16 × 64 ÷ 2 = 14
L = p × l
= 18 × 14
= 252 cm2 (b)
Nomer 5 saya belum bisa nemuin jawabannya. . maaf ya