Circle Vocab and properties of Circles
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Created by:
ginabenavidez1996 on April 19, 2012
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Description:
learning vocab terms, and properties about angles in circles.
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13 terms
Terms | Definitions |
|---|---|
 Chord | A line that passes through the circle, but does not pass through the center. |
| Diameter | a line that passes through the center of the circle. |
| Radius | a line that touches the center of the circle and the edge of the circle. |
| Semicircle | half a circle; 180 degress |
| Central Angle | the vertx of the angle measure is in the center of the circle |
| Inscribed Angle | the vertex of the measure angle is on the edge of the circle. The vertex will be doubled to find the measure of the arc, or the central angle. Any two vertextes may be placed inside the circle and they will alway share the same arc measure if the endpoints are the same. |
| Angles Inscribed in a Semicircle | will always be a 90 degress, since the arc is 180 degress. |
| Intersecting Chords | When two chords cross over each other, you'll be left with four ''legs'' multiply the opposite legs together to find x. set up a porportion. |
| Congruent Chords | the arcs will be the same. the central angles are congruent. |
| Secant | a line that intersects the circle at two points |
| Tangent | touches the circle at one point, will nevr e inside the circle, it will only ever touch the outside of the circle. The point of tangency. a radius touching a tangent will always make a 90 degress angle. |
| Inscribed Quadrilaterals | opposite angles indcribed in a circle are always have a sum of 180. |
| Parelle Lines Inside a Circle | they can be diffrent lengths, but will have congruent arcs. |
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