Question

Trevor makes a scale drawing of a doghouse that he is building. The scale he uses is 1 in. :0.4ft. What is the actual area of the floor of the doghouse if the dimensions on the scale drawing are 8in by 10in.?

Answer 1

1 in. : 0.4 ft

8 in. would be : ( 8 * 0.4) = 3.2 ft
10 in. would be : (10 * 0.4) = 4 ft

so the actual area is :
A = L * W
A = 3.2 * 4
A = 12.8 ft^2 <===