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144 cm2 = 2x + x :2 x 8 cm
144 cm2 = 1,5x . 8
144 cm2 = 12 x
x = 12 cm
X = SR
SR = 12 cm
PQ = 24 cm
PS = 10 cm
kel = 10 + 10 + 12 + 24 = 56 cm