A right angle triangle has one 90 degree angle and two acute angles
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It is an isosceles triangle; and if it has a 90 degree angle and two 45 degree angles then it is an isosceles right angle triangle.
If there are two 90 degree angles on the shape (example: squares or rectangles' corners)
Since it's more than one degree, it's plural, therefore it would be "degrees". If it were one degree, then you would say "one degree Celsius".
5 images will be formed and how when two plane mirror are tilted at an angle of 60 degree
Octagonal An octagon has eight sides and eight angles, and is a two-dimensional shape. In an equilateral octagon, each side has a degree measure of 135.