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Introducing Trig functions

Author:Miss Evans, azb
We have three trigonometric functions: sine, cosine and tangent. These are commonly abbreviated to 'sin' 'cos' and 'tan'. Trigonometric functions work with angles.
Move the right angle and change the value of . Look at what happens with the calculations

How do the trig functions relate to the ratio of sides?

Cosine

Is cos () =

Select all that apply
  • A
  • B
  • C
Check my answer (3)

Tangent

Is tan () =

Select all that apply
  • A
  • B
  • C
Check my answer (3)

Sine

Is sin () =

Select all that apply
  • A
  • B
  • C
Check my answer (3)

SOHCAHTOA

SOHCAHTOA is used in Trigonometry to help us remember the functions. What does it mean? Hint: how does it relate to the above ratios?

Make a note of SOHCAHTOA so you can remember how to use it on the next activity.

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