When it is an isosceles right angled triangle: with angles that are 90-45-45.
hypotenuse
None
by using rightangle triangle
The angles of any triangle add up to 180 degrees.
The 3 interior angles of any triangle add up to 180 degrees.
You can't as there is no hypotenuse in an equilateral triangle. The hypotenuse is the side of a triangle which is opposite a right angle (90°); all angles in an equilateral triangle are 60°.
If the hypotenuse and a leg of a right triangle are congruent to the hypotenuse and a leg of another right triangle, then the triangles are congruent.
The hypotenuse is the longest side of a right angled triangle.
Only a right triangle has a hypotenuse. An isosceles triangle can be a right triangle but it doesn't have to be. If it's not, then it doesn't have a hypotenuse.
Only a right triangle has a hypotenuse, and yes,when there's a hypotenuse, it's the longest side.
The hypotenuse
The hypotenuse of a right triangle is the side opposite the right angle. It is the longest of the three sides in the triangle.