It depends what you need to calculate. There are various formulas for this. It is a branch of mathematics called trigonometry.
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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!
David Beckham
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.