TS EAMCET · Maths · Circle

The area (in sq. units) of the triangle formed by the two tangents drawn from the extremal point $O (0, 0)$ to the circle $x^{2} + y^{2} - 2 g x - 2 h y + h^{2} = 0$ and their chord of contact is

A $\frac{g h}{h^{3} + g^{2}}$ sq. units
B $\frac{g h}{h^{2} + g^{3}}$ sq. units
C $\frac{h g^{3}}{h^{2} + g^{2}}$ sq. units
D $\frac{g h^{3}}{h^{2} + g^{2}}$ sq. units

Verified Solution

Answer & Solution

Correct Answer

(D) $\frac{g h^{3}}{h^{2} + g^{2}}$ sq. units

Step-by-step Solution

Detailed explanation

Circle: x2+y2-2gx-2hy+h2=0 Cg,h, radius =g2+h2-h2=g Length of tangent OP=OQ=S1=h2=h Area of ∆OPQ=12·OP·OQ×sin2θ =12h2sin2θ In ∆OPC, ∠P=90°, tanθ=PCOP=gh Now, sin2θ=2tanθ1+tan2θ=2ghh2+g2 So, Area of…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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The area (in sq. units) of the triangle formed by the two tangents drawn from the extremal point O0,0 to the circle x2+y2-2 gx-2hy+h2=0 and their chord of contact is

Step-by-step Solution

The area (in sq. units) of the triangle formed by the two tangents drawn from the extremal point $O (0, 0)$ to the circle $x^{2} + y^{2} - 2 g x - 2 h y + h^{2} = 0$ and their chord of contact is