Indirect Measurement

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Today's free 6th grade math video is once again demonstrating practical applications of proportions. It's important for students to be able to see the real world uses of math and Prof. Burger does this with two examples.

Want to measure the height of a telephone pole? It turns out that using mathematics, the notion of similar triangles and ratios and proportions, we put all those ideas together, and we can find the height without doing anything dangerous like going up there with a yardstick. The idea is to realize that we can actually produce two similar triangles. Imagine that the sun is shining down way up here somewhere and it's casting a shadow. So it is easy to count, because it's on the ground, and we are safely on the ground. And so we begin the process of computing indirect measurements.

Don't forget there are two lessons on this video. Just click on the forward button directly to the left of the time stamp to go to the next lesson.


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This page contains a single entry by April Stockwell published on June 16, 2010 3:13 PM.

Similar Figures was the previous entry in this blog.

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