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Verified answer
Mapel MatematikaBab Bangun Datar
p = 3 + l
L = 40 cm^2
L = p x l
40 = (3 + l) (l)
40 = 3l + l^2
l^2 + 3l - 40 = 0
(l + 8)(l - 5) = 0
l = -8
l = 5 (pilih yg positif, Krn jarak tdk mungkin negatif)
l = 5 cm
p = 3 + l = 8 cm
Keliling
= 2 (p + l)
= 2 (8 + 5)
= 2 (13)
= 26 cm