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How well do you understand the concepts and skills introduced in this lesson?

Which type of angle is shown below?

A 90 degree angle
  1. obtuse angle
  2. acute angle
  3. straight angle

An obtuse angle measures between 90 and 180 degrees.

A right angle measures 90 degrees.

An acute angle measures between 0 and 90 degrees.

A straight angle measures 180 degrees.

Which classification describes the angle pair shown?

A 60 degree angle and a 30 degree angle.
  1. right angles
  2. supplementary angles
  3. adjacent angles

Right angles measure exactly 90 degrees.

Supplementary angles sum to 180 degrees.

Adjacent angles share a common side and common vertex.

Complementary angles sum to 90 degrees.

Which equation should be used to solve for the unknown variable, x, in the image below?

A detailed description of this image follows in the next paragraph.

A 180 degree angle consisting of two angles: angle CBA and angle ABD. angle CBA is labelled with the equation 5x-18. angle ABD is labelled with the equation 4x+45.

  1. \(5x − 18 + 4x + 45 = 90\)
  2. \(5x − 18 = 4x + 45\)
  3. \(5x − 18 + 4x + 45\)

This equation is for a linear pair of angles.

This equation is for a complementary pair of angles.

This equation is for a pair of vertical angles.

This is an expression and not an equation. The equal sign is missing.

Summary

Questions answered correctly:

Questions answered incorrectly: