Circle Vocabulary Flashcards
Circle
All points in a plane that are a given distance from a given point
Diameter
The chord that intersects the center of the circle
Radius
1/2 the diameter. Measure from the center to the curve.
Tangent
A line that intersects a circle at only one point
Secant
A line that intersects a circle at two points
Chord
A line segment with endpoints on the circle
Circumference
The distance around the circle. The perimeter of the circle.
Inscribed circle
A circle is inscribed in a polygon if it is tangent to the sides of the polygon
Inscribed polygon
A polygon is inscribed in a circle if it’s vertices are tangent to the circle.
Circumscribed circle
A circle that passes through the vertices of a polygon. The polygon is inscribed in the circle.
Arc
A portion of the circle’s circumference
Sector
A portion of the circle’s area.
Central Angle
An angle whose vertex is at the center of the circle
Inscribed angle
An angle whose vertex is on the circle.
Intercepted arc
An arc whose endpoints are on the sides of an inscribed angle.