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SHSAT Math · Geometry

Angles & Lines Practice

Angle relationships, parallel lines, and transversals. This is one of the skills tested on the SHSAT; the 2026 exam is computer-based with 50 Math questions in a 90-minute section. Try the samples below, then practice the full topic with instant feedback and explanations.

Free sample questions

Question 1

Two angles are supplementary. If one angle measures 18∘18^{\circ}, what is the measure of the other angle?
  • A18∘18^{\circ}
  • B162∘162^{\circ}
  • C342∘342^{\circ}
  • D72∘72^{\circ}
Show answer and explanation

Answer: B

Supplementary angles sum to 180∘180^{\circ}, so the other angle is 180∘−18∘=162∘180^{\circ} - 18^{\circ} = 162^{\circ}.

Question 2

Two angles are supplementary. If one angle measures 123∘123^{\circ}, what is the measure of the other angle?
  • A57∘57^{\circ}
  • B237∘237^{\circ}
  • C123∘123^{\circ}
  • D33∘33^{\circ}
Show answer and explanation

Answer: A

Supplementary angles sum to 180∘180^{\circ}, so the other angle is 180∘−123∘=57∘180^{\circ} - 123^{\circ} = 57^{\circ}.

Question 3

Two angles are supplementary. If one angle measures 111∘111^{\circ}, what is the measure of the other angle?
  • A69∘69^{\circ}
  • B249∘249^{\circ}
  • C21∘21^{\circ}
  • D111∘111^{\circ}
Show answer and explanation

Answer: A

Supplementary angles sum to 180∘180^{\circ}, so the other angle is 180∘−111∘=69∘180^{\circ} - 111^{\circ} = 69^{\circ}.

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