Ex 10.2, 12 - Chapter 10 Class 12 Vector Algebra
Last updated at May 29, 2018 by Teachoo
Transcript
Ex 10.2, 12 Find the direction cosines of the vector 𝑖 + 2 𝑗 + 3 𝑘 . Let 𝑎 = 𝑖 + 2 𝑗 + 3 𝑘 = 1 𝑖 + 2 𝑗 + 3 𝑘 Direction ratios are a = 1 , b = 2 , c = 3 Magnitude of 𝑎 = 12+ 22+ 32 𝑎 = 1+4+9 = 14 Direction cosines are 𝑎 𝑎, 𝑏 𝑎, 𝑐 𝑎 Direction cosines of 𝑎 = 𝟏 𝟏𝟒, 𝟐 𝟏𝟒, 𝟑 𝟏𝟒
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