Similar Triangles for Indirect Measurement of River Width
- Azucena Overman
You want to build a bridge across a wide river from point A to B and need to determine the distance to plan the bridge. Look at the ratios to determine what kind of proportion that will contain the width of the river. You can move points A, B, C and D. Segment BE is parallel to segment CD.
Compare the ratios of the sides of the triangles.