Question

How can you tell if a triangle is a right triangle with one 90 degree angle?

Choose the best answer.

(1 point)

You would have to know two of the angles or all three sides to test the Pythagorean theorem.

Draw the triangle and use a protractor to measure the length of the sides and angles.

Look and see if the triangle looks like it has two perpendicular sides.

Plot the triangle on the coordinate plane and use the coordinates to see if the triangle is a right triangle.
Skip to navigation

Answer 1

"You would have to know two of the angles or all three sides to test the Pythagorean theorem."

Reason: knowing two angles lets you see if one is 90° (angles sum to 180°), and knowing all three side lengths lets you check a^2 + b^2 = c^2. The other options are unreliable or unnecessary.