WA.5.3. Core Content: Triangles and quadrilaterals (Geometry/Measurement, Algebra) Students focus on triangles and quadrilaterals to formalize and extend their understanding of these geometric shapes. They classify different types of triangles and quadrilaterals and develop formulas for their areas. In working with these formulas, students reinforce an important connection between algebra and geometry. They explore symmetry of these figures and use what they learn about triangles and quadrilaterals to solve a variety of problems in geometric contexts.
5.3.A. Classify quadrilaterals.