You will definitely encounter angle problems on the Mathematics Knowledge subtest on the ASVAB. The following practice questions ask you to find an unknown angle, and then to identify an angle type.

Practice questions

  1. Find angle b:


    A. 120 degrees B. 125 degrees C. 104 degrees D. 130 degrees

  2. Angle b is a(n)


    A. acute angle. B. straight angle. C. obtuse angle. D. reflex angle.

Answers and explanations

  1. The correct answer is Choice (D).

    Angles around a point always add up to 360 degrees. The diagram shows the measurements of all the angles except b, so you can solve this problem in a couple of ways. You can use algebra:


    You can also subtract the angles you know from 360 to find what's left over, which is b:

    360 – 68 – 80 – 82 = 130

  2. The correct answer is Choice (D).

    A reflex angle is one that's greater than 180 degrees. An acute angle is one that's less than 90 degrees, a straight angle is a straight line that measures exactly 180 degrees, and an obtuse angle is one that's greater than 90 degrees but less than 180 degrees.

About This Article

This article is from the book:

About the book author:

Angie Papple Johnston joined the U.S. Army in 2006 as a Chemical, Biological, Radiological, and Nuclear specialist, ready to tackle chemical weapons in a Level- A HAZMAT suit. She's currently the CBRN noncommissioned officer-in-charge of an aviation battalion in Washington, D.C.

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