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MA.8.GR.1.4 · Geometric Reasoning

Complementary, Supplementary, Vertical, and Adjacent Angles: Sample FAST Questions

Angle relationships in 8th grade cover complementary pairs that add to 90 degrees, supplementary pairs that add to 180 degrees, and vertical angles that are always equal. Measures are often given as algebraic expressions, so solving starts with writing an equation.

How the FAST tests this benchmark

The FAST shows a labeled diagram and asks for a missing measure through the equation editor or multiple choice. When angles are written as expressions like 3x + 10, students solve for x and then still have to compute the angle, which is where points get dropped.

Skills students need

  • Find complementary and supplementary angle measures
  • Identify vertical and adjacent angle pairs
  • Write and solve equations from angle expressions
  • Find a missing angle measure from a diagram

Try 6 real MA.8.GR.1.4 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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Question 1EasyGraphing
The square corner of a picture frame is a right angle, 90°. It is split into a 27° angle and one other angle. Plot the measure, in degrees, of the other angle on the number line.

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More 8th grade geometric reasoning benchmarks

MA.8.GR.1.5

Interior and Exterior Angles of Triangles

MA.8.GR.1.6

Interior Angle Sums of Polygons

MA.8.GR.2.1

Identifying Translations, Reflections, and Rotations

MA.8.GR.1.4: Angle Relationships Practice | Algebro