Grade 6 · Measurement
Area of Triangles, Parallelograms, and Trapezoids
Every area formula comes from the rectangle. A triangle is half a parallelogram (which is a transformed rectangle). A trapezoid is the average of two parallel sides. Students who derive these connections don't memorize formulas — they understand them.
LESSON VIDEO
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Lesson video
A short walkthrough to play in class or assign for flipped/at-home viewing.
WHAT STUDENTS WILL LEARN
✓Derive area formulas for triangles, parallelograms, and trapezoids
✓Understand the relationship between these shapes and rectangles
✓Calculate area of each shape using the appropriate formula
✓Apply area to solve real-world problems