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No. A triangle's angles must add up to 180 degrees so it cannot have two right angles.
However, the answer is yes if you are talking about a triangle on the surface of a sphere. In this case the geometry is non-Euclidean. If you are staying with standard Euclidean geometry, then the answer no above is correct.
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Are two right triangles similar if an acute angle of one triangle is congruent to an acute angle of the other triangle?
Yes, you have two congruent angles in each triangle, one right and one acute so the third angles must be equal also.
Can a right-angled triangle be isosceles?
Yes, it is called a right isosceles triangle. The the longest side is across from the right angles as usual, and the other two sides are of equal distance
An isosceler triangle has two equal sides?
Yes! An isosceles triangle has 2 equal sides and two base angles equal.
Can you have a right angled isosceles triangle?
Yes you can, by having other two angles of 45 degrees. 45+45+90=180. There are 180 degrees in a triangle.
If two angles of a triangle are equal the sides opposite those angles are equal?
Yes.
