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keliling = 2(2x+-1+x+2)
keliling = 2(2x+x+-1+2)
keliling = 2(3x + 1)
keliling = 6x + 2
b) keliling = 2(p+l)
50 = 2(2x+-1+x+2)
50 = 2(2x+x+-1+2)
50 = 2(3x + 1)
50 = 6x + 2
6x = 50-2
6x = 48
x = 48/6
x = 8
c) panjang = 2x - 1 = 2x8 - 1 = 16-1 = 15 cm
lebar = x+2 = 8 + 2 = 10 cm
K=2((2x-1)+(x+2))
K=2(3x+1)
K=6x+2
jika K=50
50=6x+2
50-2=6x
48/6=x
x=8
p=2x-1
p=2*8-1
p=15
l=x+2
l=8+2
l=10