Because the phrase 'right angle' indicates 90 degrees whereas there is no such angle as a 'left angle'
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A right angle triangle must have one corner of 90 degrees, otherwise it is not a right angle.
A right angle triangle
Yes. That is why it is called a right angle triangle!Yes. That is why it is called a right angle triangle!Yes. That is why it is called a right angle triangle!Yes. That is why it is called a right angle triangle!
A right angle triangle has a right angle and two acute angles that all add up to 180 degrees.
Yes it is a right angle triangle.
The side opposite the right angle of a right angle triangle is the hypotenuse