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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. In a triangle, angle A = 90° and angle B = 38°. What is angle C?

    Answer: 52°

    Angle C = 180° − 90° − 38° = 52°.

  2. Which angle pair is always congruent when two parallel lines are cut by a transversal?

    Answer: Alternate interior angles

    Alternate interior angles formed by a transversal and parallel lines are always equal.

  3. Isosceles triangle RST has RS = RT and vertex angle R = 100°. What is each base angle?

    Answer: 40°

    Each base angle = (180° − 100°) ÷ 2 = 40°.

  4. Parallel lines are cut by a transversal. The angle at the top-left is 115°. What is the co-interior angle at the bottom-right?

    Answer: 65°

    Co-interior angles are supplementary: 180° − 115° = 65°.

  5. In similar triangles PQR and STU, angle P = 55° and angle Q = 75°. What is angle U?

    Answer: 50°

    Angle R = 180° − 55° − 75° = 50°; U corresponds to R, so angle U = 50°.

  6. Lines a and b are parallel. An alternate exterior angle at a measures 62°. What is the alternate exterior angle at b?

    Answer: 62°

    Alternate exterior angles formed by parallel lines are equal: 62°.

  7. Two parallel lines are cut by a transversal. Corresponding angles are (7m − 11)° and (4m + 16)°. What is m?

    Answer: 9

    7m − 11 = 4m + 16 → 3m = 27 → m = 9.