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Angle between Pair of Straight Lines

In triangle A...

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In triangle ABC cosa/a=cosb/b=cosc/c the value of r1+r2+r3/r is equal to

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Q. If, in a triangle

△ A B C, cos A + cos B + cos C = \frac{7}{4}

\frac{R}{r}

A B C

cos A + cos B + cos C = \frac{7}{4}

\frac{R}{r}

Q. In a triangle

A B C

(cos A + cos B + cos C)

Q. Assertion :In a

△ A B C

a < b < c

r

is inradius and

r_{1}, r_{2}, r_{3}

are the axradii opposite to angle

A, B, C

respectively, then

r < r_{1} < r_{2} < r_{3}

△ A B C, r_{1} r_{2} + r_{2} r_{3} + r_{3} r_{1} = \frac{r_{1} r_{2} r_{3}}{r}

Q. In a triangle ABC, if

\frac{cos A}{a} = \frac{cos B}{b} = \frac{cos C}{c}

△ A B C

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Angle between Pair of Straight Lines

Standard XII Mathematics

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