You can use Word's drawing toolbar to insert a right-triangle. No need to
get one from the internet. Right-click any toolbar and choose Drawing. On
the Drawing toolbar, click AutoShapes - Basic Shapes, and click the triangle
(2nd row from top, last item in row). That will give you a large drawing +
sign. Drag to create a triangle, then release the mouse button when it's
about the size you want. Use any of the sizing handles to change its shape.
User the green handle to rotate it, if desired.