Asked by junior

A set of stairs leading to the entrance of a building is designed in the shape of an isosceles trapezoid with the longer base at the bottom of the stairs and the shorter base at the top. If the bottom of the stairs is 21 feet wide and the top is 14 feet wide, find the width of the stairs halfway to the top.

All Answers 1

Answered by GPT-5 mini AI
Widths vary linearly between the parallel bases, so halfway up the height the width is the average of the bases:
(21 + 14)/2 = 35/2 = 17.5 feet.