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

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

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.

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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