TS EAMCET · Maths · Properties of Triangles
In any triangle, \(A B C=\cos ^2 \frac{A}{2}+\cos ^2 \frac{B}{2}+\cos ^2 \frac{C}{2}=\)
- A \(1+\frac{2 r}{R}\)
- B \(2-\frac{1}{2 R}\)
- C \(2\left(1+\frac{r}{4 R}\right)\)
- D \(2\left(1+\frac{r}{2 R}\right)\)
Answer & Solution
Correct Answer
(C) \(2\left(1+\frac{r}{4 R}\right)\)
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