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 Simple Trigonometry – Finding Sides of Right Angled Triangles Simple trigonometry can be used with right angled triangles to a side
given a side and one of the interior angles other than the right angle,

 [Image: o-level-maths-notes-simple-trigonometry-...999f0f.gif]
With the sides of the triangle as labelled above, we can use one of the formulae:[Image: o-level-maths-notes-simple-trigonometry-...92d29d.gif]Example: If we have[Image: o-level-maths-notes-simple-trigonometry-...b6bcc5.gif]and[Image: o-level-maths-notes-simple-trigonometry-...cefe6f.gif]and want to find[Image: o-level-maths-notes-simple-trigonometry-...8d96a1.gif]
 [Image: o-level-maths-notes-simple-trigonometry-...03bd11.gif]
For the triangle above, we have[Image: o-level-maths-notes-simple-trigonometry-...b6bcc5.gif]and[Image: o-level-maths-notes-simple-trigonometry-...cefe6f.gif]and want to find[Image: o-level-maths-notes-simple-trigonometry-...8d96a1.gif]This means we use[Image: o-level-maths-notes-simple-trigonometry-...460ad6.gif]Example: If we have[Image: o-level-maths-notes-simple-trigonometry-...b6bcc5.gif]and[Image: o-level-maths-notes-simple-trigonometry-...cefe6f.gif]and want to find[Image: o-level-maths-notes-simple-trigonometry-...c8f082.gif]
[Image: o-level-maths-notes-simple-trigonometry-...03bd11.gif]

For the triangle above, we have[Image: o-level-maths-notes-simple-trigonometry-...b6bcc5.gif]and[Image: o-level-maths-notes-simple-trigonometry-...cefe6f.gif]and want to find[Image: o-level-maths-notes-simple-trigonometry-...c8f082.gif]This means we use[Image: o-level-maths-notes-simple-trigonometry-...e046e9.gif]Example: If we have[Image: o-level-maths-notes-simple-trigonometry-...b6bcc5.gif]and[Image: o-level-maths-notes-simple-trigonometry-...287c80.gif]and want to find[Image: o-level-maths-notes-simple-trigonometry-...5d960d.gif] 
[Image: o-level-maths-notes-simple-trigonometry-...a60fbb.gif]
For the triangle above, we have[Image: o-level-maths-notes-simple-trigonometry-...b6bcc5.gif]and[Image: o-level-maths-notes-simple-trigonometry-...287c80.gif]and want to find[Image: o-level-maths-notes-simple-trigonometry-...5d960d.gif]This means we use[Image: o-level-maths-notes-simple-trigonometry-...8b48e8.gif] 

 

 
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