Area of a Trapezoid

Two identical trapezoids make a parallelogram: area = (top + bottom) × height ÷ 2

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About This Practice

Two identical trapezoids join into a parallelogram whose base is exactly (top + bottom), so the trapezoid’s area = (top + bottom) × height ÷ 2. Tap “Flip & join” to watch the transformation and make sense of every piece of the formula.

Tap “Flip & join”: a second identical trapezoid turns a half-turn and joins the first into a parallelogram whose base is (top + bottom). Half of that parallelogram is the trapezoid's area.

MediumEstimated Time: 10mintrapezoid areaflip & joinparallelogramformula

How to Play

  1. Look at the trapezoid: find its top base, bottom base and height.
  2. Tap “Flip & join” and watch the second identical trapezoid turn a half-turn.
  3. Check the parallelogram: what is its base equal to? (top + bottom)
  4. Half of the parallelogram’s area is the trapezoid’s.
  5. Write the formula and match each part to the picture.

Learning Objectives

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