Converse: If the square of the length of the longest side of a triangle is equal to the sum of the squares of the lengths of the other two sides, thetriangle is a right triangle.
pythagoras theorem -  a2 + b2 = c2,
where a and b are the altitude and height of the triangles  and c is the hypotenuse
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U can only use the therom in a right angle triangle which means any one angle is exact 90degree. when u have a triangle with one angle 90 the angle opposite to he 90 degree is called hypotenuse. the therom means the square of hypotenous is equal to the square of of the other 2 sides 
i dodnt know the converse of it sryy