1.

The distance between two points A(a cosθ, 0), B(0, asinθ) is ………………. A) a B) a2C) √a D) 0

Answer»

Correct option is (A) a

Distance between points \(A\,(a\,cos\theta,0)\;\&\;B\,(0,a\,sin\theta)\) is

\(AB=\sqrt{(0-a\,cos\theta)^2+(a\,sin\theta-0)^2}\)

\(=\sqrt{a^2\,cos^2\theta+a^2\,sin^2\theta}\)

\(=\sqrt{a^2\,(cos^2\theta+sin^2\theta)}\)

\(=\sqrt{a^2}\)      \((\because cos^2\theta+sin^2\theta=1)\)

= a

Hence, distance between points \(A\,(a\,cos\theta,0)\;\&\;B\,(0,a\,sin\theta)\) is a.

Correct option is A) a



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