Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11
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One Angle of a Triangle 2 3 X Grades and Another is 3 2 X Degrees While the Third is π X 75 Radians. Express All the Angles in Degrees. - Mathematics

One angle of a triangle \[\frac{2}{3}\] x grades and another is \[\frac{3}{2}\] x degrees while the third is \[\frac{\pi x}{75}\] radians. Express all the angles in degrees.

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One angle of the triangle = \[\frac{2}{3}x \text{ grad }\]
\[= \left( \frac{2}{3}x \times \frac{9}{10} \right)^\circ\left[ \because 1 \text{ grad }= \left( \frac{9}{10} \right)^\circ\right]\]
\[ = \left( \frac{3}{5}x \right)^\circ\]
Another angle = \[\left( \frac{3}{2}x \right)^\circ\]
\[\because 1\text{ radian }= \left( \frac{180}{\pi} \right)^\circ\]
\[\text{ Third angle of the triangle }= \frac{x\pi}{75}\text{ rad }\]
\[ = \left( \frac{180}{\pi} \times \frac{x\pi}{75} \right)^\circ\]
\[ = \left( \frac{12}{5}x \right)^\circ\]
\[\frac{3}{5}x + \frac{3}{2}x + \frac{12}{5}x = 180 \text{ (Angle sum property) }\]
\[ \Rightarrow \frac{6x + 15x + 24x}{10} = 180\]
\[ \Rightarrow \frac{45x}{10} = 180\]
\[ \Rightarrow x = 40\]
Thus, the angles are: 
\[\left( \frac{3}{5}x \right)^\circ= 24^\circ\]
\[\left( \frac{3}{2}x \right)^\circ = 60^\circ \]
\[ \left( \frac{12x}{5} \right)^\circ= 96^\circ\]

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RD Sharma Class 11 Mathematics Textbook
Chapter 4 Measurement of Angles
Exercise 4.1 | Q 4 | Page 15
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