Mastering the Calculator using the Sharp EL-531LH 31
11. Trigonometric functions
The keys involved are:
Important: Make sure that your calculator is in the correct mode. For example, if your
calculator has RAD or GRAD on the display and you wish to work in degrees, press the DRG
key until the display shows DEG.
Example 1
In the right-angled triangle below, the length of the side opposite the 20° angle needs to be
calculated.
To find the length of the side labelled x cm, use
5 cm
20˚
x cm
tan20
5
x
x
°=
⇒ =°
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