Refer to c^2=a^2+b^2 (^2 means squared) C is the hypotenuse and will be the longest measure So 15^2= 9^2+12^2 225=225 If both sides are equal then the triangle is a right triangle, if the hypotenuse (or c) is lower or higher than you can determine whether it’s obtuse or acute It would be a right triangle
