pilihan ganda dari gambar tersebut A.525 B.392 C.784 D.250 E.615

C. 784
Semogaa Bermanfaat;)

Keliling = 11.200 cm
2(p + l) = 112 m
(p + l) = 56 m
x + y = 56
y = 56 - x
Luas = p.l
L = x.y
L = x(56 - x)
L = 56x - x^2
L' = 56 - 2x = 0
=> -2x = -56
=> x = 28
y = 56 - x = 56 - 28 = 28
Luas = x.y = 28(28) = 784 m^2