A small staircase is made so that the horizontal piece of each step is 10 in long and 25 in wide each step is 5 in above the previous one what is the surface area of the staircase

Question

This question is hard

Answer 1

The surface area of one step is made up of two rectangles.

The flat step (tread) has an area of 10×25=250sq in and the riser has an area of 5×25=125 sq in. So the total surface area of one step is 250+125=375 sq in. This is the same as the area of a single rectangle 15×25. If you were carpeting the staircase you would multiply 375 by the number of steps to find out the total surface area of the staircase.