Area of a Parallelogram

Cut along the height, slide, and it's a rectangle: area = base × height

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About This Practice

The parallelogram area formula isn’t for memorizing: cut off a right triangle along the height, slide it to the other side, and the parallelogram becomes a rectangle — same base, same height, so area = base × height. Tap “Cut & slide” to watch the transformation, then adjust the base and height and see the formula update live.

Tap “Cut & slide”: the right triangle cut from the left slides across, and the parallelogram becomes a rectangle — same base, same height, so the area is base × height. Then adjust base and height and watch the formula update live.

MediumEstimated Time: 10minparallelogram areacut and slidetransformationbase × height

How to Play

  1. Look at the parallelogram: find its base and height.
  2. Tap “Cut & slide” and watch the right triangle slide from left to right.
  3. Check the new rectangle: what do its length and width correspond to?
  4. Write the formula: parallelogram area = base × height.
  5. Change the base and height with the buttons and watch area and formula move together.

Learning Objectives

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