Colorado Common Core Standards
CO.6.4. Shape, Dimension, and Geometric Relationships
6.4.1. Objects in space and their parts and attributes can be measured and analyzed. Students can:
6.4.1.a. Develop and apply formulas and procedures for area of plane figures.
6.4.1.a.i. Find the area of right triangles, other triangles, special quadrilaterals, and polygons by composing into rectangles or decomposing into triangles and other shapes. (CCSS: 6.G.1)