Desmos Geometry

Today in grade 10 we worked on understanding properties of quadrilaterals and triangles. We were looking at the lengths of sides, and the slopes of sides, and also the lengths, slopes and midpoints of diagonals.

One way of exploring the ideas was to use graph paper and draw shapes and measure and explore lengths and slopes. Another more dynamic way is to use desmos geometry

Here’s a photo of what we did to explore a rhombus (losange en français)

Here’s a link to a dynamic copy. Click and drag points and see how the lengths of the diagonals change, how the side lengths are all the same, and how the diagonals are always perpendicular.