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This lesson uses the unit circle to find trigonometric ratios of angle angles from 0o to 360o



 






 



TRIGONOMETRY 2

This is the part of mathematics concerned with the relationship between the angles and sides of triangles. The knowledge of trigonometry is used in constructions of buildings, towers, and many other things. It is also used in determining bearings, angles of elevation and depression.

The aircraft is 500m above the tower and the horizontal distance from the tower is 8km.To find the value of the angle of elevation we use a trigonometric ratio called a tangent ratio.






Drawing the unit circles
Below are examples of unit circles.

NOTE:
A unit circle is a circle of radius 1 unit drawn on a grid using any
scale.

click the button on the graph to view them.








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