Question

The surface area of a rectangular prism is 150 cm². If all the sides are tripled, what will the new surface area be?

Answer 1

SA=2(LW+LH+WH)
if all are trippled then

SA=2(3L3W+3L3H+3W3H)
SA=2(9LW+9LH+9WH)
SA=2(9)(LW+WH+WH)
SA=9(2(LW+WH+WH))
the SA will be multiplied by 9

150 times 9=1350

new surface area is$1350 cm²

Answer 2

Area of rectangle = length * breadth
if all the sides are tripled,,
New Area = 3*length * 3*breadth=9*length*breadth=9*150