As per question area of one sector =3 area of another sector ⇒ at center by one sector =3× angle at center by another sector Let one angle be θ then other =30 Clearly θ+3θ=180⇒θ=45∘ ∴ Angle between the diameters represented by combined equation ax2+2(a+bxy)+by2=0 is 45∘ ∴ Using tanθ=