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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.

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  1. Two parallel lines are cut by a transversal. One co-interior (same-side interior) angle is 65°. What is the other co-interior angle?

    Answer: 115°

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

  2. In a triangle, two angles measure 47° and 83°. What is the third angle?

    Answer: 50°

    Third angle = 180° − 47° − 83° = 50°.

  3. Two lines intersect and one angle measures 72°. What is the vertically opposite angle?

    Answer: 72°

    Vertical angles are equal; the opposite angle is 72°.

  4. A transversal crosses two parallel lines. One corresponding angle is 110°. What is the other corresponding angle?

    Answer: 110°

    Corresponding angles formed by parallel lines are equal: 110°.

  5. An isosceles triangle has a vertex angle of 40°. What is each base angle?

    Answer: 70°

    2x + 40 = 180 → x = 70°.

  6. The exterior angle of a triangle is 120°. One non-adjacent interior angle is 45°. What is the other non-adjacent interior angle?

    Answer: 75°

    45° + x = 120° → x = 75°.

  7. Two supplementary angles are in the ratio 1:3. What is the smaller angle?

    Answer: 45°

    x + 3x = 180° → x = 45°.