
Now, divide 15 by 20 to change the fraction into a decimal.
You now need to find an angle whose tangent is 0.75. To do
this, use your scientific or graphing calculator. (On the
scientific calculator, enter 0.75. You now need to activate the tan^{1}
key (it is located above the tan
key). To activate this tan^{1}
key, press 2nd (or shift) and
then the tan key. On the
graphing calculator, activate the tan^{1}
first, and then enter 0.75.)
rounding as directed. 