Question

How do you know the triangle is right angled?

• A. The triangle is right angled when the three sides of a triangle make $a^2+b^2=c^2$
• B. The triangle is right angled when the three sides of a triangle do not make $a^2+b^2=c^2$
• C. The triangle is not right angled when the three sides of a triangle make $a^2+b^2=c^2$
• D. The three sides of a triangle are all same.

Answer 1

The correct option is A The triangle is right angled when the three sides of a triangle make $a^2+b^2=c^2$

If a triangle is right triangle then the square of longest side is equal to the sum of squares of other two sides.

If $a,b,c$ are the sides with $c$ as longest side then

$a^2+b^2=c^2$

So option $A$ is correct.