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a.
L = a*t/2
= 84 * 80 /2
= 84 * 40
L = 3360 cm²
b.
K = 5x - 16 + 6x - 4 + 3x + 20\
280 cm = 14x
x = 280/14
x = 20
Sisi 1 = 5x - 16 = 5.20 - 16 = 100 - 16 = 84 cm
Sisi 2 = 6x - 4 = 6.20 - 4 = 120 - 4 = 116 cm
Sisi 3 = 3x + 20 = 3.20 + 20 = 60 + 20 = 80 cm
AB=84
BC=116
AC=80