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Δ PQR-এ ∠PQR < 90° এবং PM ⊥ QR হলে, নিচের কোনটি সঠিক?

P R^{2} = P Q^{2} + Q R^{2} - 2 Q R . R M

P R^{2} = P Q^{2} + Q R^{2} - 2 Q R . Q M

P R^{2} = P Q^{2} + Q R^{2} - 2 Q R . R M

P R^{2} = P Q^{2} + Q R^{2} - 2 Q R . O M

ANS : 2

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