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3. K = 2( 18 +10)
= 56
L = 18 x 10 = 180

4. 130 = 2(2x+5 + x + 6)
130 = 2(3x + 11)
130 = 6x + 22
6x = 130 - 22
6x = 108
x = 18
pjg AB = 2(18) + 5 = 41
pjg BC = 18 + 6 = 24
luas = 41x24 = 984