A regular triangle would have all angles equal, each being 60o.
Thus a right angled triangle is an "irregular" triangle in that one of its angles is 90o which is not 60o.
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-- Every triangle, no matter what its shape or size, has three angles inside it that add up to 180 degrees. -- Whyen you say "regular right angled triangle", I hope you don't mean that all three of its sides are the same length ... that's what "regular" usually means in geometry. It's impossible for a right triangle to have all of its sides equal.
A right-angled triangle is one which has, as one of the angles, an angle of exactly 90 degrees.
No a right angled triangle consists of two acute angles and one right angle
By using the formula a2+b2=c2, where a is one side of the right-angled triangle and b is the other side of the right angle triangle. C stands for the hypotenuse of the right-angled triangle. Note: this formula only works for RIGHT-ANGLED TRIANGLES!!!
I depends what posision the triangle is in.