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Ex 8.1, 3 - If sin A = 3/4, calculate cos A and tan A. - Ex 8.1

  1. Chapter 8 Class 10 Introduction to Trignometry
  2. Serial order wise
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Ex 8.1, 3 If sin A = 3/4 , calculate cos A and tan A. sin A = 3/4 (๐‘ ๐‘–๐‘‘๐‘’ ๐‘œ๐‘๐‘๐‘œ๐‘ ๐‘–๐‘ก๐‘’ ๐‘ก๐‘œ โˆ ๐ด)/๐ป๐‘ฆ๐‘๐‘œ๐‘ก๐‘’๐‘›๐‘ข๐‘ ๐‘’ = 3/4 โ‡’ ๐ต๐ถ/๐ด๐ถ = 3/4 Let BC = 3x AC = 4x We find AB using Pythagoras Theorem Hence, using Pythagoras theorem (Hypotenuse)2 = (Height)2 + (Base)2 AC2 = AB2 + BC2 (4x)2 = AB2 + (3x)2 16x2 = AB2 + 9x2 16x2 โ€“ 9x2 = AB2 7x2 = AB2 AB2 = 7x2 AB = โˆš7๐‘ฅ2 AB = โˆš7 x Now, we need to find cos A & tan A

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