The formula for the area of a trapezoid is

Question

A =
h(B + b)
2
.
The area of the truss is 20 square feet. Find the height of the truss if the shorter base is the same as the height h.

Answer 1

so
20=1/2 *h(h+B)

cant be solved without the longer base given.

Answer 2

sorry the longer base is 18

Answer 3

Then put 18 in for B, and solve. Note it is quadratic equation, put it in standard form
ax^2 + bx +c=0
and use the quadratic equation