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panjang = 2x-1
lebar = x+2
maka :
bagian a )
K = 2 x (p+l)
= 2 x (2x-1 + x+2)
= 2 x (3x+1)
= 6x + 2
bagian b )
K = 6x + 2
50 = 6x+2
6x = 50-2
x = 48/6
x = 8 cm
bagian c )
panjang = 2x8 - 1 = 15 cm
lebar = 8+2 = 10 cm