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Test
Math
Domain
Geometry and Trigonometry
Skill
Lines, angles, and triangles
Difficulty
Easy
ID: 42b4493b
Modded SAT Question Bank by Abdullah Mallik

In a right triangle, the measure of one of the acute angles is 51°. What is the measure, in degrees, of the other acute angle?

  1. 6

  2. 39

  3. 49

  4. 51

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Correct Answer: B
Rationale

Choice B is correct. The sum of the measures of the interior angles of a triangle is 180 degrees. Since the triangle is a right triangle, it has one angle that measures 90 degrees. Therefore, the sum of the measures, in degrees, of the remaining two angles is 180-90, or 90. It’s given that the measure of one of the acute angles in the triangle is 51 degrees. Therefore, the measure, in degrees, of the other acute angle is 90-51, or 39.

Choice A 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. This is the measure, in degrees, of the acute angle whose measure is given.

Question Difficulty: Easy
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