Question

In a triangle, if the square of one side is equal to the sum of the squares of the other two sides , then the angle opposite the first side is a.

• A. Less than a right angle
• B. More than a right angle
• C. Not a right angle
• D. Right angle

Answer 1

The correct option is D Right angle

If $a^2+b^2=c^2$, c is the hypotenuse and angle opposite to the hypotenuse is a right angle in Pythagoras theorem , so the angle opposite the first side that is the hypotenuse is a right angle.
Therefore, D is the correct answer.