A greeting card has a perimeter of 74 centimeters and an area of 330 square centimeters. What are the dimensions of the greeting card?

Answer 1

330 = LW

74 = 2L +2W

37 = L+W

L= 37-W

330=(37-W)W = 37W -W^2

W^2 -37W +330 = 0

W = 37/2 + (1/2)sqr(37^2 -1320) = 37/2-7/2 =30/2 = 15 cm wide

L=22 cm long

15x22 =330