Landon welded three pieces of metal together to form a triangle with side lengths that measure 8 inches, 9 inches and 17 inches. Is the triangle that Landon created a right triangle?

Points j and k plotted on the coordinate grid are two vertices of rectangle jklm rectangle jklm has an area of 7 square units point j is located at 2,1 and point k is located at -5,1 each vertex of the rectangle is located at a point that has integer coordinates. what is the perimeter of rectangle jklm? (need answer asap)