Semi-regular tessellations combine two or more different regular polygons to fill the plane. Can you find all the semi-regular tessellations?
Take any triangle, and construct squares on each of its sides. What do you notice about the areas of the new triangles formed?
Join the midpoints of a quadrilateral to get a new quadrilateral. What is special about it?
Follow the instructions to create a regular pentagon. Can you prove it is indeed regular?
Can you find an efficent way to mix paints in any ratio?
How can visual patterns be used to prove sums of series?