An office building casts a 90 foot shadow. At the same time of day, a 5 foot woman standing near the building casts an 8 foot shadow. What is the approximate height of the building to the nearest foot?

Question

anonymous · Answer

similar triangles.

height of woman is 5 foot and cast 8 foot shadow. The building is x feet and casts a 90 foot shadow

Use ratio and proportion

5: 8 = x:90

do you know how to do that?

anonymous · Answer

no i have a really hard time with this
we have to go to the nearest foot 
so how do i do that

anonymous · Answer

$$\huge \frac 58 = \frac x{90}$$

multiply both sides by 90 and you can get x. That's the answer. I'm too lazy to solve it mentally. go get a calculator