How to construct an incircle
Click on the step by step animation button at the bottom left of the display below to see the construction of the inscribed circle one step at a time.
First the bisectors of the three angles A, B and C are constructed. These three lines meet at the incentre. Next a perpendicular from the incentre to one side of the triangle is constructed, followed by the point where this perpendicular meets the side. The incentre and this point are used to construct the incircle.