# Pair of straight lines – Theorem

Pair of straight lines – Theorem Statement: The product of the perpendicular from (α, β) to the pair of lines ax² + 2hxy + by² = 0 is . Proof: Let ax² + 2hxy + by² = 0 … (1) Represent lines l₁ x + m₁ y = 0 and l₂ x + m₂ y = Read more about Pair of straight lines – Theorem[…]