The app allows you to drag corner to draw different triangles on squared paper. Based on the triangle made, two names of the triangle will be displayed. One based on its sides, and the other one is based on its angles.

Names of triangles by sides:
Equilateral triangle
Isosceles triangle
Scalene triangle

Names of triangles by angles:
Acute-angled triangle
Right-angled triangle
Obtuse-angled triangle

Note that, it is impossible to draw equilateral triangles on squared paper.