In this page, you can find the complete solutions of the exercise of Properties of Triangle chapter from Basic Mathematics Grade XI book published and distributed by Sukunda Pustak Bhawan. In the above-mentioned book, Solutions of Triangle is the 7th chapter and has only one exercise. This is the solut…

Solution: Given, Height of the building (AD) = 20m Angle of depression ( angle.FEA ) = 30° Angle of elevation (angle.CDE ) = 60° From the figure, ABCD is a rectangle.  So, AD = BC = 20m and AB = CD . In right angled ∆CDE tan 60° = $\dfrac{ EB + BC}{CD}$ or, √3 = $\dfrac{ x + 20}{CD} or, √3 CD = x + 20 or, CD = $\dfrac{x +20}{√3}$ In…

Unit 5 - Trigonometry | Solution of Trigonometric Equations Solution of Trigonometric Equations is the fifth chapter in Trigonometry for Class 10 students who are studying Optional Mathematics subject. This is the chapter requiring complete implication of the rules and formulae we discussed in the first three chapters: multiple angl…

Evaluate the following: 1. $\displaylines{lim \\ x \to 0} \dfrac{sinax}{x}$ Solution: Given function takes indeterminate (0/0) form at x = 0. So, $\displaylines{lim \\  x \to 0} \dfrac{sinax}{x} * \dfrac{a}{a}$ $= a * \displaylines{lim \\ x \to 0} \dfrac{sinax}{ax}$ [$\because \displaylines{lim \\x \to 0} \dfrac{sinx}{x} = 1$] $= a …

Revision Area of triangle = $\dfrac{1}{2} ab sinc$ The solutions of Area of Triangle chapter have been added alternatively. Leave a comment in the comment box if you have any doubts about the solutions or if the answer doesn't match to that given in the book. …

Exercise 16.1 Other solutions from this unit: Exercise 16.2 - Area of Triangles General Section 1. Find the unknown lengths of the sides of the following figures. [Refer to your book for the figures] a)  Solution : Here, $tan45 ^o = \dfrac{x}{20}$ $or, 1 = \dfrac{x}{20}$ $\therefore x = 20m$ And, $sin 45 ^o = …