Question 618938
If it is a right angle triangle then the Pythagorean theorem will prove to be true i.e. the hypotenuse (the longest side) can be accurately calculated from the measurements of the other two sides using the theorem.

Let us call the hypotenuse 'c' and the other two sides 'a' and 'b'

The theorem states that {{{c^2 = a^2 + b^2}}}

so in this case:
{{{145^2}}} should be equal to: {{{17^2 + 144^2}}}

{{{145^2 = 21025}}}
{{{17^2 + 144^2 =  289 + 20736 = 21025}}}


As both are equal then there is indeed a right angle.