To find the width of the building halfway to the top, you can use the properties of similar triangles. The ratio of corresponding sides in similar triangles is constant.
Assuming the Transamerica Building is a right-angled triangular prism, let's denote the width halfway to the top as (b)
Without the exact total height of the building, we can't find the exact value of (b) However, you can use this formula once you know the total height.
If you have additional information, such as the angles or side lengths of the triangular faces, a more precise calculation may be possible.