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Question

If an angle of a right-angled triangle is 400, find the other acute angle.

A
600
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B
400
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C
800
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D
500
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Solution

The correct option is D 500
One of the angles of a right angled triangle is 900 and the other is given as 400.
Sum of the angles of a triangle is 1800.
Let the second acute angle be x.
x+400+900=1800x+1300=1800x=18001300=500
Second acute angle =500

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