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Question

Which of the following can be the sides of a right angled triangle ?

A
35,17,18
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B
39,19,18
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C
35,27,18
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D
41,40,9
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Solution

The correct option is D 41,40,9
We know that in a right angle triangle,
The sum of the squares on two sides of a triangle is equal to the square on the third side, then the triangle is a right angle.
Base2+Prependicular2=Hypotenuse2
Now, we go to the options,
A) 182+172 is not equal to 352 so leave this option.
B) 192+182 is not equal to 392 so leave this option.
C) 272+182 is not equal to 352 so leave this option.
D)402+92 is equal to 412 so right this option.
Hence, all option is incorrect.
Now , we take the triplet 41,40 ,9
402+92=1681
$40^2+9^2=41^2$
Hence, 41,40,9 are the sides of a right angle triangle
option D is correct.

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