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UPSC NDA I 2011 Mathematics Paper

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For the next four (4) items that follow:

A B C

is a triangle right angled at

B

. The hypotenuse

(A C)

is four times the perpendicular

(B D)

is four times the perpendicular

(B D)

drawn to its from the opposite vertex and

A D < D C

.

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Question : 31 of 120

Marks: +1, -0

What is one of the acute angles of the triangle?

$15^{\circ}$
$30^{\circ}$
$45^{\circ}$
None of the above

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