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Question

If one angle of a right angled triangle measures 25, then find the measure of the other acute angle.


A

50

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B

55

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C

65

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D

70

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Solution

The correct option is C

65



By angle sum property of a triangle,
A+B+C=180

On substituting the values,
A+25+90=180
A+115=180
A=180115
A=65

Alternate solution:
We know that, in a right angled triangle, the sum of the angles other than 90o will be complementary to each other.

So,
A+C=90o
A=90C
=9025
=65


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