Which statement about a right triangle is true

Which best explains why this triangle is or is not a right triangle?

Plz determine whether the polynomial is a difference of squares and if it is, factor it. y2 – 196 is a difference of squares: (y + 14)2 is a difference of squares: (y – 14)2 is a difference of squares: (y + 14)(y – 14) is not a difference of squares

How can you construct perpendicular lines and prove theorems about perpendicular lines