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Properties of Parallelogram Calculator

Online parallelogram properties calculator. Enter the base, side and height to find area and perimeter, and learn opposite sides/angles properties—great for geometry.

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Opposite sides/angles equal, diagonals bisect; area=base×height
Base
Adjacent side
Perpendicular height

📖 Tutorial | Parallelogram

1. Definition
A parallelogram has both pairs of opposite sides parallel.
2. Formula & Notation
a, bBase and side
hHeight
SArea, a·h
3. Properties & Laws
  • Opposite sides equal;
  • Opposite angles equal;
  • Diagonals bisect;
  • Area=base×height.
4. Steps
  1. Enter base a, side b, height h;
  2. Click "Calculate";
  3. Or click "Load Example".
5. Worked Examples
Example: base 8, side 5, height 4.
Solution: area 32, perimeter 26.
6. Common Pitfalls
Height matches the base;
Diagonals generally unequal;
Do not multiply adjacent sides.

❓ FAQ | Parallelogram

Properties?
Equal opposite sides/angles; diagonals bisect.
Area?
Base × height.
8,5,4?
Area 32, perimeter 26.
Equal diagonals?
Generally not, but they bisect.
Symmetric?
Generally not.
How to test?
Parallel/equal opposite sides or bisecting diagonals.