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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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