In keynote, an equilateral triangle can be made easily.
The way to make an equilateral triangle
Select Shape and Pentagon in the toolbar.
A pentagon is made.
Drag the green dot to a counterclockwise direction.
Number of the vertexes decreases.
Stop dragging at a triangle.
Right click the triangle and select Make Editable.
The shape becomes editable.
Press return key.
Editing is ended, and the shape is determined.
The equilateral triangle is completed.
