Geometry, Unit 7: Circles. Key terms, formulas, and worked-example cues a high school student meets for this unit, building on prior units. Front: the term, formula name, or short problem cue. Back: the definition, formula, or solution method.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What is a circle?
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The set of all points equidistant from a fixed center point- What is the radius of a circle?
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The distance from the center to any point on the circle- What is the diameter of a circle?
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The distance across the circle through its center, twice the radius- What is a chord of a circle?
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A segment connecting two points on the circle- What is the longest chord in any circle?
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The diameter- What is a secant line?
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A line that intersects a circle at two points- What is a tangent line to a circle?
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A line that touches the circle at exactly one point- What is true about a tangent line and the radius drawn to the point of tangency?
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They are perpendicular- What is an arc of a circle?
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A portion of the circle's circumference- What is a minor arc?
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An arc smaller than a semicircle (less than 180 degrees)- What is a major arc?
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An arc larger than a semicircle (more than 180 degrees)- What is a semicircle?
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An arc that is exactly half the circle (180 degrees)- What is a central angle?
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An angle whose vertex is at the center of the circle- What is the relationship between a central angle and its intercepted arc?
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They have the same degree measure- What is an inscribed angle?
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An angle whose vertex lies on the circle, formed by two chords
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