JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

1 Easy

1 of 1

Application +4 | -1

If in a triangle

ABC,\,\,\frac{{b + c}}{{11}} = \frac{{c + a}}{{12}} = \frac{{a + b}}{{13}}

then

\cos \,\,A

is equal to

View answer and explanation

Correct option: A

1/5

Option A (1/5) is correct because by setting up ratios and solving for the sides of the triangle, we can use the cosine rule to find cos A.

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2 s