By using Pythagoras' theorem which states that for any right angle triangle the square of its hypotenuse is equal to the sum of the squares of its sides and given by the following formula:-
a2+b2 = c2 whereas a and b are the sides of the triangle with c being its hypotenuse or longest side
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Yes, although a triangle (in normal geometry) can only have one right angle, no more. It is possible for a triangle to have all three right angles in spherical geometry (if you were to draw the triangle on a sphere).
scalene,acute,obtuse,right
a triangle is a three sided shape. there are 4 types of triangles: scalene, isosceles, right angled triangle and an equilateral triangle.
In Euclidean geometry, a triangle must be one of these: acute, obtuse, or right. Maybe there is a non-Euclideangeometry for which some obtuse triangles can contain a right angle, but it doesn't happen in Euclidean geometry.
In the geometry of triangles, there is no such thing as stability.