1.

Distance of the point (tanθ, 1) from origin is A) cotθ B) sinθ C) tanθ D) secθ

Answer»

Correct option is (D) sec θ

Distance of point \(A(tan\,\theta,1)\) from origin O(0, 0) is

\(AO=\sqrt{(0-tan\,\theta)^2+(0-1)^2}\)   (By distance formula)

\(=\sqrt{tan^2\,\theta+1}\)

\(=\sqrt{sec^2\,\theta}\)                 \((\because1+tan^2\,\theta=sec^2\,\theta)\)

\(=sec\,\theta\)

Hence, distance of the point \((tan\,\theta,1)\) from origin is \(sec\,\theta.\)

Correct option is D) secθ



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