TS EAMCET · Maths · Properties of Triangles

In $Δ A B C$ , right-angled at $A$ , the circumradius, inradius and radius of the excircle opposite to $A$ are respectively in the ratio $2 : 5 : λ$ , then the roots of the equation $x^{2} - (λ - 5) x + (λ - 6) = 0$ are

A $3, 4$
B $5, 13$
C $1, 3$
D $8, 13$

Verified Solution

Answer & Solution

Correct Answer

(C) $1, 3$

Step-by-step Solution

Detailed explanation

Given that, A=90°. Circumradius R=a2sinA=a2sin90°=a2. Inradius r=s-atanA2=s-atan90°2=s-a. Exradius r1=stanA2=stan90°2=s R:r:r1=a2:s-a:s=2:5:λ ⇒a2=2⇒a=4 ⇒s-a=5⇒s-4=5⇒s=9 ∴ λ=9 Now, the equation is…

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.

Same subject

Explore more questions on app

From TS EAMCET

Explore more questions on app

In ΔABC, right-angled at A, the circumradius, inradius and radius of the excircle opposite to A are respectively in the ratio 2:5:λ, then the roots of the equation x2-λ-5x+λ-6=0 are

Step-by-step Solution

In $Δ A B C$ , right-angled at $A$ , the circumradius, inradius and radius of the excircle opposite to $A$ are respectively in the ratio $2 : 5 : λ$ , then the roots of the equation $x^{2} - (λ - 5) x + (λ - 6) = 0$ are