Practice Test GeeksBluebook SAT Practice Test
← All Bluebook SAT Test Flashcard Decks

Lines, Angles, and Triangles Flashcards

7 cards from real Bluebook SAT Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Lines, Angles, and Triangles flashcards as text

  1. Angle A and angle B are supplementary. Angle A is 4 times angle B. What is angle A?

    Answer: 144°

    A + B = 180° and A = 4B → 4B + B = 180° → B = 36°; A = 144°.

  2. Triangle ABC has angle A = 50° and the exterior angle at B is 110°. What is angle C?

    Answer: 60°

    Exterior angle = sum of remote interior angles: 110° = 50° + C → C = 60°.

  3. A transversal makes a 55° angle with parallel line p. What is the size of the co-interior angle on parallel line q on the same side?

    Answer: 125°

    Co-interior angles are supplementary: 180° − 55° = 125°.

  4. In a triangle, two sides are 9 cm and 13 cm. Which of the following CANNOT be the third side?

    Answer: 22 cm

    Triangle inequality: third side must be less than 9+13=22 and more than 13−9=4; 22 ≥ 22, which fails strict inequality.

  5. In similar triangles KLM and NOP, angle K = 48° and angle L = 77°. What is angle O?

    Answer: 77°

    Similar triangles have equal corresponding angles; angle O corresponds to angle L = 77°.

  6. A straight line AB has point C on it such that angle ACD = 125°. What is angle BCD?

    Answer: 55°

    Angles ACD and BCD are a linear pair: angle BCD = 180° − 125° = 55°.

  7. Parallel lines j and k are cut by transversal t. The alternate interior angles are (9x − 3)° and (7x + 11)°. What is x?

    Answer: 7

    Alternate interior angles are equal: 9x − 3 = 7x + 11 → 2x = 14 → x = 7.

How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

  1. satsuite.collegeboard.org — Score release, test delivery, time limit, test dates, fees, registration, retake policy · verified Oct 2026
  2. bluebook.collegeboard.org — Test delivery · verified Oct 2026