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Sum of the angles in a triangle

Aviation Mechanic General (AMG) practice question 15 of 25 on Mathematics. ACS element AM.I.H.K3 · difficulty: recall. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONThe sum of the three angles in any triangle is always equal to

  1. A180 degrees
  2. B90 degrees
  3. C360 degrees, the same as a full circle
Show the answer and explanation

Correct answer: A. 180 degrees

  • A — correct The handbook states that the sum of the three angles in a triangle is always equal to 180°.
  • B — incorrect 90° is the measure of a single right angle, not the total of a triangle's three angles.
  • C — incorrect 360° is the total for a full circle; a triangle's angles total half of that.

BACKGROUND

A triangle is a three-sided figure, and the sum of its three angles is always 180°. Triangles are classified by their sides (equilateral, isosceles, scalene) and by their angles (acute, right, obtuse). A right triangle has one 90° angle, an acute triangle has all three angles less than 90°, and an obtuse triangle has one angle greater than 90°. Knowing the 180° total lets you find a missing angle when the other two are known.

STUDY TIP

Remember the pair of facts together: a right angle is 90°, and a triangle's three angles total 180°.

KEY POINTS

  • Three angles of any triangle total 180°.
  • A right angle is 90°.
  • Triangle types by angle: acute, right, obtuse.

SOURCES

  • FAA-H-8083-30B ch03 "Triangle"
Practice the Aviation Mechanic General (AMG) test →Timed 60-question exam, by ACS area, or review your misses. Free.
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SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-30B Aviation Maintenance Technician Handbook – General, 14 CFR part 43 and part 65. Regulations and handbooks are revised; confirm details against the current edition.