Kristen is wrapping presents for the holidays. She has a box that measures 4 ft. x 2 ft. x 2 ft. How many square feet of wrapping paper does she need to cover the box without overlapping?
we can either just mutiply them and add them (area=legnth times width) or we can use Surface Area formula (which can be found for only rectangular prisms)
SA=2(LW+LH+WH)
L=4 W=2 H=2 sub SA=2(42+42+2*2) SA=2(8+8+4) SA=2(20) SA=40
