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280 = 2 x 55 + 2 x panjang
280 = 110 + 2 x panjang
kurangi 110 di kedua sisi, jadi:
170 = 2 x panjang
bagi 2 di kedua sisi, jadi:
panjang = 85 cm(B)
semoga membantu:)
K persegi panjang = 2 x (p + l)
K = 280
280 = 2 x (p + 55)
280 = 2p + 110
2p = 170
p=85
Semoga bisa membantu...