Yes
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a2+b2=c2, but that only works for right triangles, where c is opposite the right angle. The law of cosines, see Related Link below, will help for non right triangles, but you need to know one of the angles.
Any right-angled triangle
The law of cosines with a right angle is just the pythagorean theorem. The cosine of 90 degrees is 0. That is why the hypotenuse squared is equal to the sum of both of the legs squared
Triangles without right angles are:- Scalene triangles Obtuse triangles Isosceles triangles Equilateral triangles
no