All right angle triangles have a 90 degree angle and two acute angles which all together the 3 angles add up to 180 degrees.
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In common with all triangles it has 3 sides.
They all comply with Pythagoras' theorem of: a2+b2 = c2
no
Yes- but not all isosceles triangles are right triangles. Isosceles means that two sides are the same length, and two angles are the same.
Absolutely. Any two congruent right triangles will form a rectangle, and if the right triangles are isosceles right triangles, they will form a square.