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Midsegment Theorem Calculator

Online triangle midsegment calculator. Enter the third side to find the midsegment (half of it), with the theorem stated—ideal for triangle geometry.

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The midsegment is parallel to the third side and half its length
The third side opposite the midsegment

📖 Tutorial | Midsegment

1. Definition
The midsegment joins the midpoints of two sides.
2. Formula & Notation
bThird side
b/2Midsegment
3. Properties & Laws
  • Parallel to the third side;
  • Half its length;
  • Three midsegments;
  • They form a similar triangle.
4. Steps
  1. Enter third side b;
  2. Click "Find";
  3. Or click "Load Example".
5. Worked Examples
Example: third side 12.
Solution: midsegment = 12/2 = 6.
6. Common Pitfalls
Joins two side midpoints;
A median joins a vertex to a midpoint;
Half the third side.

❓ FAQ | Midsegment

What is a midsegment?
Joins two side midpoints.
Its property?
Parallel, half the third side.
Third side 12?
6.
Same as a median?
No; median joins a vertex to a midpoint.
How many?
Three.
They form?
A similar triangle.