vertex (plural vertices)
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It will have an L shape flipped around at the corner. or you can use a protractor or type in google images 'right angle triangle' they will have an L shape at the corner of the right angled triangle.
The apex counts as one of the three corners of a triangle.
A specific name for a triangle depends on its characteristics. A specific name for a triangle depends on its characteristics. A specific name for a triangle depends on its characteristics. A specific name for a triangle depends on its characteristics.
Because the Bottom left corner makes a 90 degree angle like this |_ and a 90 degree angle is called a Right angle thus the name Right angled Triangle
Only if it is a right angle triangle which will have only 1 square corner of 90 degrees