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SOLVED PROBLEMS

  1. In D ABC, Ð B = 900, BC = 1, AC = 2. Find Ð A, ÐC and AB.

Solution

cos C =
cos C = cos 600     ..... [From the table]
C = 600
A = 600
and by the Pythagoras theorem, AB2 = AC2 - BC2


  1. Triangle ABC is isosceles with Ð B = Ð C = p / 6 rad. AD is the median meeting BC in point D. Find AD and AB. Given that BC = 6 cms.

Solution

SinceÐ B =Ð C= p / 6 rad = 300
Since D ABC is an isosceles triangle,
median AD is perpendicular to side BC
Also BD = DC = 3 cm and Ð BAD = Ð CAD = 600

 

 

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Index

2.1 Trigonometric Ratio of Acute Angles
2.2 Fundamental Relation between the trigonometric Ratios of an angle
2.3 Functions of General Angles or t Ratio
2.4 Tables of Trigonometric Function
Supplementary Problems

Chapter 3





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