It is called a right angle triangle.
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A five right angle turn is 450 degress. It ia an ubtuse angle, which means it ia greater than a right angle, 90 degress.
90
Any angle less than 90 degrees.
Ia's an acute angle since any angle under 90 degrees is an acute angle
There are an infinite list of different sets of angles that an isosceles trianglecan have. All you know about them is:-- two of them must be the same size-- all three of them must add up to 180 degrees.