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
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°.
In a triangle, two angles measure 47° and 83°. What is the third angle?
Answer: 50°
Third angle = 180° − 47° − 83° = 50°.
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°.
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°.
An isosceles triangle has a vertex angle of 40°. What is each base angle?
Answer: 70°
2x + 40 = 180 → x = 70°.
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°.
Two supplementary angles are in the ratio 1:3. What is the smaller angle?
Answer: 45°
x + 3x = 180° → x = 45°.
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