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37 votes
37 votes
Find the distance d from across the river. Assume the triangles are similar and the ratio of d to 90 feet is the same as the ratio of 90 ft to 30 feet.

Find the distance d from across the river. Assume the triangles are similar and the-example-1
User Pkofod
by
3.2k points

1 Answer

15 votes
15 votes

Since the triangles are similar, we will use the idea of proportion to find the

distance d across the river.

That is;


(d)/(90)=(90)/(30)

cross-multiply

30d =8100

Divide both-sie of the equation by 30

d =270ft

User Corey G
by
2.9k points
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