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INTRODUCTION TO TRIGONOMETRY AND ITS APPLICATIONS
www.ncert.nic.inINTRODUCTION TO TRIGONOMETR Y AND ITS APPLICATIONS 89 • The ‘line of sight’ is the line from the eye of an observer to the point in the object viewed by the observer. • The ‘angle of elevation’ of an object viewed, is the angle formed by the line of sight with …
INTRODUCTION TRIGONOMETR Y TO 8 - NCERT
www.ncert.nic.in= = and sec A = 1 5 cos A 3 = ⋅ Example 2 : If ∠ B and ∠ Q are acute angles such that sin B = sin Q, then prove that ∠ B = ∠ Q. Solution : Let us consider two right triangles ABC and PQR where sin B = sin Q (see Fig. 8.9). We have sin B = AC AB and sin Q = PR PQ Fig. 8.8 Fig. 8.9 ±