Triangle: A closed figure with three sides.
A parallelogram has two sets of parallel lines. Parallel: Two lines in a two-dimensional space that do not meet (for example, the opposite sides of a square).Location terms: Words and phrases that describe the location of an object in relation to other objects, including words like on, under, on top of, next to, in front of, behind, beneath, underneath, inside, outside, at/on the bottom/top, between, and adjacent to (this is just a sample, there are many more).Equilateral: Sides that are the same length.Face: Surface planes of three-dimensional shapes.Edge: The meeting of two faces on a three-dimensional shape.With young children, the terms large, medium, small, taller, shorter, longer, less than and greater than are all appropriate. Dimensions/Size: Terminology to describe the dimensions of an object or set.Congruent: Identical in size and shape.Angle: Two lines that meet to make a corner.Qualities (usually used with geometry) of a figure, including sides, size, angles, etc.