Mathematics - Geometry - Perimeter and Area - Area of parallelograms and trapezoids - Parallelogram and Trapezoid Areas

6 steps: (1) Parallelogram: Area = base × height (perpendicular height, not slant side!). Example: base=10, height=6, A=60. (2) Why it works: same as the rectangle after rearrangement. (3) Trapezoid: has two parallel sides (bases) of different lengths. (4) Formula: A = (1/2)(b₁ + b₂) × h. (5) Why: i