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Angles of polygons
Interior angles of polygons
The total interior angles of a triangle = 180
Total internal angle of any polygon can be worked out from triangles
The total interior angles of a square (or rectangle) = 360
Why must a square add up to 360 (in pictures)
The total interior angles of a pentagon = 540
Why must a pentagon add up to 540 (in pictures)
The total interior angles of a hexagon = 720
Why must a hexagon add up to 720 (in pictures)
The total interior angles of a heptagon = 900
Why must a heptagon add up to 900 (in pictures)
The total interior angles of an octagon = 1080
Why must an octagon add up to 1080 (in pictures)
Sum of all internal angles of a polygon
Internal angle of a regular polygon
Exterior angles of polygons
Total exterior angle of a polygon
External angles of a regular polygon
Area of a triangle
Manipulating shapes
Circumference, area and volume
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Interior angles of polygons
What is an interior and exterior angle?
Interior = Inside
Concentrate on the beginning of the word IN.
Example 1
Example 2
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