Class 11MathematicsTrigonometrical EquationsRelation between sides and angles, Solutions of triangles
EasyWith usual notations,in any $\triangle ABC$,if $a \cos B = b \cos A$,then the triangle is:
- Aan isosceles triangle
- Ban equilateral triangle
- Ca right-angled triangle
- Da scalene triangle
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Similar Questions
If in a triangle $ABC$,$\frac{2 \cos A}{a} + \frac{\cos B}{b} + \frac{2 \cos C}{c} = \frac{a}{bc} + \frac{b}{ca}$,then the value of the angle $A$ is:
In $\Delta ABC$,if $\cos \frac{A}{2} = \sqrt{\frac{b + c}{2c}}$,then:
Easy
View SolutionIn a triangle $ABC$,if $(b+c)^2 \sin^2\left(\frac{A}{2}\right) + (b-c)^2 \cos^2\left(\frac{A}{2}\right) = K(1 - \cos 2A)$,then $K =$
In a $\triangle ABC$,if $r_1 = 2r_2 = 3r_3$,then $a : b =$
In a $\triangle ABC$,the mid-point of $BC$ is $D$. If $AD$ is perpendicular to $AC$,then $\cos A \cos C=$
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