Question 11In ΔPQR, PD⊥QR such that D lies on QR. If PQ = a, PR = b, QD = c and DR = d, then prove that (a+b) (a-b) = (c+d) (c-d).

Question 11In ΔPQR, PD⊥QR such that D lies on QR. If PQ = a, PR = b

1.	Question 11In ΔPQR, PD⊥QR such that D lies on QR. If PQ = a, PR = b, QD = c and DR = d, then prove that (a+b) (a-b) = (c+d) (c-d).
Answer» Question 11 In $Δ P Q R$ , $P D ⊥ Q R$ such that D lies on QR. If PQ = a, PR = b, QD = c and DR = d, then prove that (a+b) (a-b) = (c+d) (c-d).