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Q.

How do you know that a triangle is right angled?


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a

The triangle is right angled when the three sides of a triangle makea2+b2=c2

b

The triangle is right angled when the three sides of a triangle do not makea2+b2=c2

c

The triangle is not right angled when the three sides of a triangle makea2+b2=c2

d

The three sides of a triangle are all the same. 

answer is A.

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Detailed Solution

Given a right-angle triangle.
It is a figure of right-angle triangle,
Question ImageIf a triangle is a right angled triangle then the square of the longest side is equal to the sum of squares of the other two sides.
By pythagoras theorem,
If a,b,c are the sides with c as longest side, then a2+b2=c2.
Hence, the correct option is 1.
 
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