GeoGebra
has the built-in functions sin(<x>)
, cos(<x>)
and tan(<x>)
for calculating the sine, the cosine and the tangent of angles.
GeoGebra
uses the names asin(<x>)
and acos(<x>)
, for the inverse functions and for in the interval , and atan(<x>)
for for any . Use the inverse functions to calculate the angles of a right triangle when you already know two or all the side lengths, by typing the expression directly in Algebra View
or CAS
.
When you input angles measured in degrees, you have to use the symbol (keyboard shortcut alt+o
on Windows).
Note! If you try to insert a value less than or greater than 1, GeoGebra
will return a number containing the letter . This indicates that you have received a complex solution. Unless you know that complex solutions are fine for your problem, this solution would indicate that you input something wrong.
Note! In some versions of GeoGebra
, angles in Algebra View
are by default measured in degrees, while angles in CAS
are measured in radians. If you want CAS
to use degrees, use the commands asind(<x>)
, acosd(<x>)
, and atand(<x>)
, which are the regular commands with a d
at the end of the command name to denote the use of degrees.
You can also get the answer in degrees quickly by dividing your answer by or by the string deg
, such as asin(<x>)/
. It may seem strange to divide by , but it works!
GeoGebra
Instruction 1
Algebra View
Algebra View
under View
in Menu
. Enter
. GeoGebra
Instruction 2
CAS
CAS
under View
in Menu
. Enter
, you’ll get the exact answer. If you press Symbolic Evaluation
, you’ll also get the exact answer. If an exact value does not exist, GeoGebra
writes the answer in radians. In that instance, press Numeric Evaluation
to get the answer as a decimal number.