To find out if the triangle is a right triangle, we must check if the following equation is true:
[tex](15)^2+(20)^2=(25)^2^{}^{}^{}[/tex]
on the left side, we have:
[tex](15)^2+(20)^2=225+400=625^{}[/tex]
and on the right side, we have:
[tex](25)^2=625[/tex]
since on both sides we get 625, we have that the brace forms a right triangle.
