Question 1

What is a Inscribed Circle Calculator?

Accepted Answer

The inscribed circle (incircle) is the largest circle that fits inside a triangle, tangent to all three sides. Its radius (inradius) equals the triangle area divided by the semi-perimeter.

Question 2

How does the Inscribed Circle Calculator work?

Accepted Answer

r = Area / s Then: Where s = (a+b+c)/2 (semi-perimeter) Then: Area found via Heron's formula Then: Centre is at the intersection of the angle bisectors (incentre).

Question 3

Can you give an example of how to use the Inscribed Circle Calculator?

Accepted Answer

Example: Input Triangle 3, 4, 5 gives a result of r = 6/6 = 1.

Question 4

Is the Inscribed Circle Calculator free to use?

Accepted Answer

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

Question 5

How accurate is the Inscribed Circle Calculator?

Accepted Answer

Our Inscribed Circle Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Inscribed Circle Calculator

Inscribed Circle (Inradius)

What is Inscribed Circle Calculator?

How to Use Inscribed Circle Calculator

Example Inscribed Circle Calculator

Inradius Examples

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