Question

Choose a counterexample that proves that the conjecture below is false.. abc is a right triangle, so angle A measures 90 degrees. 1. Angle c is 30 degrees. 2.Angle b is 90 degrees. 3. Angle c is 20 degrees. 4. Angle b is an obtuse angle

Answer 1

Choose a counterexample that proves that the conjecture below is false.. abc is a right triangle, so angle A measures 90 degrees.

Answer: Out of all the options shown above the one that represents the counterexample that proves that the conjecture presented above is false is answer choice 2. Angle b is 90 degrees. The reason being that in a right angle there is only one angle that measures 90 degrees.

I hope it helps, Regards.

Answer 2

I think the answer is : 2. angle b is 90 degrees

The sum of the three angle of the triangle must be equal to 180 degrees. If both angles a and angle b is 90 degrees, that won't leave any more room for angle c

hope this helps