If it looks like an l (L)
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It is a right angle triangle because the 3rd angle has to be 90 degrees
A right triangle, by definition, has a right (or 90o) angle. The side that is opposite that right angle is the hypotenuse. That is to say, the other two sides, which are not the hypotenuse, are the two sides which meet at a right angle.
a right angle is 90 degrees a straight angle is 180 degrees you could also use a anglicize
Because a right angle is a right angle.
Assuming your question is what makes a right-angle, it is an angle of 90o .