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Angles

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Updated 2009-02-23 18:47

Angles

Question Answer
DegreeA unit of measure:
360 of them make a full circle.
RadianA unit of measure:
2 pi of them make a full circle.
Exterior AngleAn angle outside a polygon formed by two adjacent sides of the polygon.
Interior AngleAn angle inside a polygon formed by two adjacent sides of the polygon.
Exterior AngleThe Supplement of an Interior Angle.
Interior AngleThe Supplement of an Exterior Angle.
Line of SymmetryA line about which a shape can be folded in half so that both halves overlap with one another.
Line of SymmetryIf you put a mirror along this line,
you can see the whole shape.
Perpendicular LinesTwo lines that intersect in a right angle.
Parallel LinesTwo lines that never intersect.
TransversalA line that intersects two or more lines.
VertexA corner of a polygon.
10 seconds on a clock60 degrees.
1 minute on a clock6 degrees.
1 hour on a clock30 degrees.
L-Shaped Angle90 degrees.
Right Angle90 degrees.
Acute Angle0 to 90 degrees.
Obtuse Angle90 to 180 degrees.
Supplementary AnglesTotal to 180 degrees.
Complementary AnglesTotal to 90 degrees.
All Internal Angles of a TriangleTotal to 180 degrees.
All External Angles of an
n-sided Polygon
Total to 360 degrees.
All Internal Angles of an
n-sided Polygon
Total to 180 n - 360 degrees.
Adjacent AnglesThey share the same vertex and one side.
Angles formed when 2 Lines IntersectSupplementary if they are Adjacent,
Identical otherwise.
memorize

 

Please check these:
Question Answer
Straight line amount of degrees180.
Adjacent Angles= 180.
Bench Marks90 and 180 degrees.
PatternsAdjacent =180 and diagonal are the same.
memorize

References

http://www.mathsisfun.com/geometry/plane-geometry.html

See Also