Complete the missing parts of the paragraph proof. Proof: We are given a ^ 2 + b ^ 2 = c ^ 2 triangle ABC and right triangle DEF constructed with legs a and band hypotenuse n. Since triangle DEF is a right triangle, we know that a ^ 2 + b ^ 2 = n ^ 2 * b * e because of the substitution c ^ 2 = n ^ 2 Using the square root property and the principle root, we can take the square root of both sides get c approx n. By triangles ABC and DEF are congruent . Since it is given that angle F is a right angle, is also a right angle by CPCTC. Therefore, triangle ABC is a right triangle by