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K = 2p + 2l
120 = 2(7+x) + 2(2x-3)
120 = 14 + 2x + 4x - 6
120 = 8 + 6x
120 - 8 = 6x
112 =6x
x = 18,67
panjang = 7 + x
= 7 + 18,67
= 25,67 cm
=2 x(3x+4)
120= 6x +8
6x=120-8
x=112:6
x= 18,67
panjang= 7+18,67= 25,67 cm