A Mathematically Definition Would Be:
If An Angle Is a Right Angle, Then It's Measure Is 90 Degrees.
We Talked About This In Math Today :)
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There are 90 degrees in a left angle as there are in a right angle but the term 'left angle' is rarely used
With any right angle triangle
Oh honey, that's an easy one. Another name for a right angle DEF is a 90-degree angle. It's like the perfect L shape, straight up and down, no funny business. So, go ahead and call it a 90-degree angle or a right angle, whatever floats your boat.
The definition of vertices is the plural vertex. A vertex is point of intersection of two or more lines. A vertex can also be used to describe the angular point of a polygon, polyhedron, or other shape.
The answer is 31.6874, however I cannot explain the math used to get that answer..... I just drew the lines and angle on a cad system and measured the third line.