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How do you know that a triangle is right angled?

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The triangle is right angled when the three sides of a triangle make

a^{2} + b^{2} = c^{2}

The triangle is right angled when the three sides of a triangle do not make

a^{2} + b^{2} = c^{2}

The triangle is not right angled when the three sides of a triangle make

a^{2} + b^{2} = c^{2}

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 Image

If 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

a^{2} + b^{2} = c^{2}

.
Hence, the correct option is 1.

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