Question

4. A pitched roof is built with a 3:8 ratio of rise to span. If the rise of the roof is 9 meters, what is the span? 4 meters 3.375 meters 14 meters 24 meters ​

Answer 1

A 3/8 rise/span ratio means that rise = 3/8(span). We can solve from here given the rise or span. We are given rise, so we will solve for span.

rise = 3/8(span)
9 = 3/8(s)
9 = 0.375s
9/0.375 = 0.375s/0.375
24 = s

The span of the roof is 24 meters.