Given that area of one sector =3× area of another sector ⇒ Angle at centre by one sector =3× angle at centre by another sector Let one angle be θ then other =3θ Clearly θ+3θ=180⇒θ=45∘ (Linear pair) ∴ Angle between the diameters represented by pair of equation ax2+2(a+b)xy+by2=0 is 45∘ Using tanθ=