Question in-tri
In triangle , and . Which statement is sufficient to prove that triangle is equilateral?
In triangle A B C , A B = 4,680   millimeters   mm and B
Medium-difficulty · SAT Math · Lines, Angles, and Triangles — Triangle sum theorem. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
Choice A is correct. In an equilateral triangle, all three sides have the same length. It’s given that in triangle , and . Therefore, if , then all three sides of triangle have the same length, so triangle is equilateral. Therefore, is sufficient to prove that triangle is equilateral.
Choice B is incorrect and may result from conceptual or calculation errors.
Choice C is incorrect and may result from conceptual or calculation errors.
Choice D is incorrect and may result from conceptual or calculation errors.
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