Go to this page to see a worked example of a Three-Part Ratio problem.

# Category Archive: Algebraic Thinking

Apr 27

## Conic Sections on Desmos

Go to this Desmos graph https://www.desmos.com/calculator/tsfynm2to8 It shows two each of the four conic sections Circles, Ellipses, Hyperbolas, Parabolas Note: A hyperbola has two branches. Only one is shown in the image. A cone actually has two frustums. The image only shows one frustum. http://www.intmath.com/plane-analytic-geometry/conic-sections-summary-interactive.php

Apr 07

## Stacking Cups – Two Stacks

This is a 3-Act lesson. It involves systems of linear equations to model a physical situation. (This could be thought of an extension of the cup-stacking activity that has been around for some time. However, I think this lesson can be done without the original, one-stack lesson.) http://www.101qs.com/1897-stacking-cups–act-1#