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Area and Perimeter of Two-Dimensional Polygons

6th Grade · Math · Open Global Math

10 lessons

Goal

Derive and apply formulas for perimeter and area of triangles, parallelograms, rhombuses, and trapezoids with consistent metric and customary units.

10 lessons
0 of 10 done
  1. Calculating Perimeter From Side LengthsUp next
  2. Finding Unknown Side Lengths from Given PerimetersNot started yet
  3. Deriving the Area Formula for ParallelogramsYou are here
  4. Identifying Corresponding Base and Altitude in ParallelogramsNot started yet
  5. Deriving the Triangle Area Formula from Rectangles and ParallelogramsNot started yet
  6. Calculating Areas of Acute, Right, and Obtuse TrianglesNot started yet
  7. Deriving and Calculating the Area of TrapezoidsNot started yet
  8. Calculating Areas of Rhombuses and Kites Using DiagonalsNot started yet
  9. Finding Missing Dimensions from Given Polygon AreasNot started yet
  10. Solving Word Problems Involving Triangle and Parallelogram AreasNot started yet
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Learning standards covered

GlobalOGM.7.GEO.1Open Global Math Standards 2026™ · 6th Grade

Derive and apply area formulas for triangles, special quadrilaterals (rectangles, parallelograms, rhombuses, trapezoids), and irregular polygons by composition into rectangles and decomposition into triangles; solve practical area and perimeter problems involving unit consistency.