UPSC NDA I 2011 Mathematics Paper

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For the next four (4) items that follow:
ABC is a triangle right angled at B. The hypotenuse (AC) is four times the perpendicular (BD) is four times the perpendicular (BD) drawn to its from the opposite vertex and AD<DC.

Question : 31 of 120

Marks: +1, -0

What is one of the acute angles of the triangle?

15∘
30∘
45∘
None of the above

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