Geometry flashcards! Your students will learn the properties of various triangles and quadrilaterals as they draw shapes on these polished, no-prep triangle flash cards and quadrilateral flash cards aligned to the Common Core. Geometric 2D figures include equilateral triangle, isosceles triangle, scalene triangle, right triangle, square, rectangle, rhombus, parallelogram, and trapezoid. Your students will learn that all squares are rectangles, all equilateral triangles are isosceles triangles, e