Question

a rectangular is 10cm long and 8cm wide .when each side of rectangular is increased by x cm its perimeter is doubled .find the equation in x and hence find the area of the new rectangular

Answer 1

perimeter =2(l+b)
= 36cm
increased perimeter = 2(18+2x)
72 = 36 +4x
x = 9cm
increased area = 19×17
= 323 cm²