Question

find one counterexample to show that the following conjecture is false. δabc is a right triangle, so ∠a measures 90°. choose the correct answer below.

Explanation:

A counterexample to the conjecture “If \( \triangle ABC \) is a right triangle, then \( \angle A \) measures \( 90^\circ \)” must be a right triangle where \( \angle A \) is not \( 90^\circ \). Option C shows a right triangle with the right angle at \( B \), so \( \angle A
eq 90^\circ \), disproving the conjecture.

Answer:

C. (The triangle with right angle at B)