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.
Chat with our AI personalities
Two sides of a triangle do not, automatically, give you the measure of the third side. Further information about the triangle is required.
Heron's formula to find area of triangle semi perimeter(s)=sum of all the sides of triangle/2 area of tiangle=P[s(s-first side)(s-second side)(s-third side)]1/2
This will depend upon the type of triangle. For an equilateral, all sides will be the same length. For a right angle triangle, the formula a2 + b2 = c2 is used.
If you know two sides of a right triangle, the Pythagorean Formula lets you find the third side. Also, if you know all three sides of a triangle, you can confirm whether it is, or isn't, a right triangle.
The minimum third side length of a triangle having one side of 11 and another side of 5 is 6.