Geometric diagrams are not representations of physical objects but representations of mathematical ideas. What mathematical ideas do you see represented here?

Geometry

Geometry is defined as "the branch of mathematics that deals with the deduction of the properties, measurement, and relationships of points, lines, angles, and figures in space" (websters.com). What does this definition make you think of? How do you think that Geometry is going to differ from Algebra? Do you think there will be any similarities?