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Shadows Task involving Similar Triangles

I worked through this shadows task that involves similar triangles at a 2013 Common Core Workshop I attended (OGAP). I am blogging about the activities we did last summer so that they are easier for me to find when I go to plan lessons. I hope these ideas will inspire you as well.

photograph of shadow with words: "Similar triangles shadow task"

I found the answer to this task to be very unexpected! If I taught geometry, I’d definitely use this problem!

shadows task involving similar triangles

After coming home from the workshop, I was able to find the probIem online. I don’t think we were given answer choices, though.

Sarah Carter teaches high school math in her hometown of Coweta, Oklahoma. She currently teaches AP Precalculus, AP Calculus AB, and Statistics. She is passionate about sharing creative and hands-on teaching ideas with math teachers around the world through her blog, Math = Love.

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