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Geometry2010p6
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Angles of Elevation and Depression
Area and Circumference
Basic Trig
Calculators
Circle Terminology
Circles
Classifying Quadrilaterals
Cones
Cylinders
Exterior Angles
Find the area of a Sector
Finding Arc Length and Measure
Finding Central and Inscribed Angle Measurements
Finding Lateral Area
Finding Surface Areas
Finding Surface Areas 2
Finding Volume
Geometric Mean
How to Represent 3D objects
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Exterior Angles
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Exterior Angles of Polygons
The Exterior Angle is the angle between any side of a shape, and a line extended from the next side.
Note: If you add up the Interior Angle and Exterior Angle you get a straight line, 180°. (See
Supplementary Angles
)
exterior angle theorem
The Exterior Angles of a Polygon add up to 360°
In other words the exterior angles add up to
one full revolution
Think of it this way: the lines change direction and eventually return back to the start.
(
Exercise: try this with a square or some oddshaped polygon)
Note: This rule only works for
simple polygons
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Exterior Angles of Polygons
The Exterior Angle is the angle between any side of a shape, and a line extended from the next side.
Note: If you add up the Interior Angle and Exterior Angle you get a straight line, 180°. (See Supplementary Angles)exterior angle theorem
The Exterior Angles of a Polygon add up to 360°
Think of it this way: the lines change direction and eventually return back to the start.
(Exercise: try this with a square or some oddshaped polygon)
Note: This rule only works for simple polygons