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300 = 2 (p+l)
(p+l) = 300/2
(p+l) = 150
l = 150 - p = 150 - 90 = 60
Luas = panjang x lebar = 90 x 60 = 5400 m²
kliling = 2 (p + l)
300 = 2 (90 + l)
300 = 180 + 2L
300 -180 = 2 L
120/2 = L
L = 60
LUASNYA
luas = p xL
= 90 x 60
= 5400