b+(x+12)+2(х+12) b+(x+12)+2х+24 b+3х+36
P = MN + NK + KM = b + (b - 12) + 2(b - 12) = b + b - 12 + 2b - 24 = 4b - 36 = 4(b - 9)
b+(x+12)+2(х+12)
b+(x+12)+2х+24
b+3х+36
P = MN + NK + KM = b + (b - 12) + 2(b - 12) = b + b - 12 + 2b - 24 = 4b - 36 = 4(b - 9)