# GeoGebra Tutorial: Using the Perpendicular Line and the Point on Object Tools

In this tutorial, we use GeoGebra to explore the minimum sum of the distances of a point on the interior of a triangle to its sides. We learn how to use the

Steps in Creating the Applet

*Point on Object*tool and the*Perpendicular Line*tool. We also learn how to compute using the Input bar. The final output of this tutorial is shown in the following applet.Steps in Creating the Applet

**Application**

A building is going to be constructed with a triangle bounded by the roads connecting Buildings A, B, and C. A connecting pathway is to be constructed from the three roads to the building. Find the location of the building that will minimize the cost of pathway construction.