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Ch20 Geometry
Chapter 20 Geometry: Lines, Angles, Polygons, Circles
| Question | Answer |
|---|---|
| marks an exact location in space | point |
| an endless straight path with no endpoints | line |
| part of a line that has one endpoint and continues without end in one direction | ray |
| part of a line that includes two endpoints and all of the points between them | linesegment |
| an endless flat surface | plane |
| angle measures 90 degrees | right |
| angle greater than 0 less than 90 degrees | acute |
| angle greater than 90 and less than 180 degrees | obtuse |
| angle measures 180 degrees | straight |
| lines that cross at one point | intersecting |
| lines that never intersect | parallel |
| lines or segments that form right angles | perpendicular |
| point where two rays meet to form an angle | vertex |
| closed plane figure formed by three or more line segments | polygon |
| type of polygon with all sides and angles with equal measures | regular |
| polygon with 3 sides & angles | triangles |
| polygon with 10 sides & angles | decagon |
| polygon with 4 sides & angles | quadrilateral |
| polygon with 9 sides | nonagon |
| polygon with 5 sides | pentagon |
| polygon with 8 sides | octagon |
| polygon with 6 sides | hexagon |
| polygon with 7 sides | heptagon |
| Number of degrees in a triangle | 180 |
| Number of degrees in a quadrilateral | 360 |
| a line segment with one endpoint at the center of a circle and the other on the circle | radius |
| A circle is named by its ___ | center |
| a line segment that passes through the center of the circle and has its endpoints on the circle | diameter |
| a line segment with its endpoints on the circle | chord |
| number of degrees in a circle | 360 |
| number of degrees in a quarter circle | 90 |
| number of degrees in a half circle | 180 |
| number of degrees in 3/4 circle | 270 |
| number of degrees in 1/8 circle | 45 |
| a closed plane figure with all points the same distance from the center | circle |
| figures with the same size and shape | congruent |
| figures with the same shape but not the same size | similar |
| tool to measure angles | protractor |
| A figure that can be folded on a line so that the 2 parts match exactly has ___ symmetry. | line |
| A figure that can be rotated less than 360 degrees around a central point and still match the original has __ symmetry. | rotational |
Created by:
jfifty2