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Question

An angle of a right-angled triangle is 400, what is the third 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 unknown angle be x.
x+400+900=1800x+1300=1800x=18001300=500
Unknown angle =500

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