By the end of the lesson the learner can calculate interior and exterior angles of polygons.
By the end of the lesson the learner can read and use three-figure bearings.
By the end of the lesson the learner can apply bearings to direction and navigation problems.
Transcript
[0:00] A polygon is a closed shape with straight sides, named by its number of sides.
[0:45] The interior angles of a triangle add to 180 degrees, and each extra side adds another 180.
[1:30] The exterior angles of any polygon always add up to 360 degrees.
[2:15] A bearing is a clockwise angle measured from north, always written with three figures.
[3:00] Bearings help pilots, sailors and surveyors describe direction precisely.
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