Sharp EL-531LH - Page 35

32 Mastering the Calculator using the Sharp EL-531LH
The keystrokes on the calculator are:
or
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.
To find the length of the side labelled x cm, use:
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
angle
θ in degrees:
In the diagram,
x cm
20˚
7 cm
7
s
in20
7
sin20
x
x
°=
⇒ =
°
2 cm
1 cm
θ
1
c
os
2
θ =