Geometry Vocabulary Flashcards
Grade 10 · Math · Flashcards
Master the essential vocabulary of plane geometry, including lines, angles, polygons, and circle parts.
Flashcards
- Parallel Lines
- Lines in the same plane that never intersect; they have equal slopes.
- Perpendicular Lines
- Lines that intersect at exactly 90°; their slopes are negative reciprocals.
- Transversal
- A line that intersects two or more other lines at distinct points.
- Alternate Interior Angles
- Non-adjacent angles on opposite sides of a transversal between two parallel lines; they are congruent.
- Corresponding Angles
- Angles in the same position at each intersection when a transversal crosses parallel lines; they are congruent.
- Supplementary Angles
- Two angles whose measures sum to 180°.
- Complementary Angles
- Two angles whose measures sum to 90°.
- Bisector
- A ray, line, or segment that divides an angle or segment into two equal parts.
- Median (Triangle)
- A segment connecting a vertex of a triangle to the midpoint of the opposite side.
- Altitude (Triangle)
- A perpendicular segment from a vertex to the line containing the opposite side.
- Circumscribed Circle
- A circle that passes through all vertices of a polygon; its center is the circumcenter.
- Inscribed Angle
- An angle formed by two chords that share an endpoint on a circle; its measure is half the intercepted arc.
- Secant
- A line that intersects a circle at exactly two points.
- Midsegment
- A segment connecting the midpoints of two sides of a triangle; it is parallel to and half the length of the third side.
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