Linking Quadratics to Rectangle Area

Disclaimer: This is not my idea. If it is yours, I would LOVE to meet you, chat, virtually shake your hand and pat you on the back. In fact, I'll write this post TO you.

Linking quadratics to rectangle area

I came across your brilliant Quadratics activity on Pinterest after a search for ways to connect parabolas to rectangles. Some quadratic word problems are motion problems while others talk about areas of rectangles. You magically merged the two. 

I'm writing this post to keep the description of your ground-shattering activity alive. Here is the only hint of your wondrous activity I was able to find before Pinterest seemed to change things and erase photo descriptions from existence:

"Students were given: Make a rectangle with a perimeter of 40. Each were given a different base length and had to find height and area. Students graphed their rectangles base (x) vs. area (y). Equation y=x(20-x), so students got to see a parabola in action! It went great!!"

I write more about the quadratics activities we do in class in the post Fun with Quadratics

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  1. Idea might have come from Anthony Harradine? Think that's who first introduced it to me. Love it!

    1. I will have to do some research on him! Thank you! I have been wondering for a long time who came up with this idea. It's just so great.