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MA.8.GR.1.5 · Geometric Reasoning

Interior and Exterior Angles of Triangles: Sample FAST Questions

The three interior angles of a triangle add to 180 degrees, and an exterior angle equals the sum of the two remote interior angles. 8th graders use both rules, frequently with the angle measures written as algebraic expressions.

How the FAST tests this benchmark

FAST items include equation editor answers for a missing angle, multiple choice items, and matching or diagram-based items on labeled triangles. The Exterior Angle Theorem is the shortcut students skip, solving the long way and running short on time.

Skills students need

  • Apply the Triangle Sum Theorem
  • Apply the Exterior Angle Theorem
  • Solve for angle measures given as expressions
  • Identify the remote interior angles of a triangle

Try 6 real MA.8.GR.1.5 questions

These come straight from Algebro's 8th grade pre-algebra question bank, easiest first. Answer one, check it, then move to the next.

Question 1 of 6

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In the triangle shown, a side is extended to form the exterior angle at the top vertex. The two remote interior angles measure 33° and 47°. The exterior angle measures .

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More 8th grade geometric reasoning benchmarks

MA.8.GR.1.6

Interior Angle Sums of Polygons

MA.8.GR.2.1

Identifying Translations, Reflections, and Rotations

MA.8.GR.2.2

Finding the Scale Factor of a Dilation

MA.8.GR.1.5: Triangle Angles Practice | Algebro