To cast a 19 foot shadow the building would have to be 26.91 feet tall. Each foot of building/tree casts 8.47 inches of shadow.
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It works out as 12 feet and 4 inches in height
The man is twice as high as his shadow. Therefore, the tree must also be twice as high as its shadow, which would make the tree 40 feet tall.
As the sun is far enough away, the rays of light are effectively parallel. This produces similar triangles with the ratio of sides the same in each case. As the shadow of the post is 12 ft and the shadow of the tree is 24 ft, the sides of the triangle of the tree are double that of the post. Assuming the post is parallel to the tree, the tree's height is twice the height of the post → tree = 12 ft × 2 = 24ft high.
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To determine the number of stories in a building that is 90 feet high, we need to know the typical height of one story. In general, the height of one story in a building is around 10 feet, but this can vary depending on the design and purpose of the building. Therefore, if we assume a standard height of 10 feet per story, a building that is 90 feet high would have approximately 9 stories.