Sharp EL-531LH Mastering Instructions page 35

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Mastering the Calculator using the Sharp EL-531LH
The keystrokes on the calculator are:
The display should read 1.819851171, so the length of x is about 1.8 cm.
Example 2
In the right-angled triangle below, the length of the hypotenuse needs to be calculated.
7 cm
To find the length of the side labelled x cm, use:
7
° =
sin 20
x
7
⇒ =
x
°
sin 20
The keystrokes on the calculator are:
The display should read 20.466631, so the length of the hypotenuse is about 20.5 cm.
Example 3
Given the lengths of two of the sides in the right-angled triangle below, find the value of the
θ
angle in degrees:
2 cm
θ
1 cm
θ
=
In the diagram, cos
or
x cm
20˚
1
2