The slanted lines are perpendicular, and the one in the bottom story bisects the angle. Show that red equals green, so the stories have the same height.
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Solution
![](https://mirangu.com/wp-content/uploads/2024/03/Two-Story-A-Frame-HouseSolution.jpg)
Extend AB to C. Triangle ACD is an isosceles. So, AB=BC. Hence, triangles ABH and BCH’ are congruent.