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| A plane is a flat surface with no thickness. |
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| an angle that is less than 90° |
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| an angle that is 90° exactly |
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| an angle that is greater than 90° but less than 180° |
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| an angle that is 180° exactly |
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| angles that add up to 180 degrees |
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| anglea that add up to 90 degrees |
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| It just means at right angles (90°) to.
The red line is perpendicular to the blue line:[image] |
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| same shape, same angle measures (exactly the same) |
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| share a line (rooms 211 & 213 share a wall), 2 angles taht lie in the same plane, have a common vertex, a common side, but no common interior points[image] |
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| 2 nonadjacent angles formed by intersecting lines (angles opposite each other)In the diagram below, angles 1 and 4 are vertical. So are angles 2 and 3.[image] |
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| A pair of adjacent angles whose noncommon sides are opposite rays. Angles 1 and 2 below are a linear pair. So are angles 2 and 4, angles 3 and 4, and angles 1 and 3.[image] |
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| part of a line, with one end point & extends indefinitely in one direction[image] |
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| choose a point on the line, that endpoint determines an opposite ray |
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2 noncolinear rays w/a common endpoint
sides- the 2 rays
vertex- where both rays meet |
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| interior and exterior of an angle |
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| unit of measure for an angle |
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