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JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

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Application +4 | -1
If in a Δ  ABC,b+c11=c+a12=a+b13\Delta \;ABC,\frac{{b + c}}{{11}} = \frac{{c + a}}{{12}} = \frac{{a + b}}{{13}}, then cos⁡A\cos A is equal to
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Correct option: A
15\frac{1}{5}
Option B (-4) is correct because the midpoint of the rectangle's diagonal lies on the given line, allowing us to solve for c.

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