I have the following problem when I print this function
System.out.println("Area do Tetraedro = " + c1.getArea());
The value of it is very large, eg:
Area of Tetraedo = 389.71143170299734
How to leave it with two decimal places? And also, how to put the unit of measurement at the end?
You've already resolved, but you could use the class DecimalFormat of the java.text package. It has the format() method that gets a decimal and format as you wish.
You can use printf() instead of println() . Example:
System.out.printf("Area do Tetraedro = %.2f\n", c1.getArea());
Where %.2f means that the second argument of the method, that is, the first after the String, will be represented as a floating point number limited to showing only two decimal places.
\n plays the role of breaking the line, which made println() and that printf() does not automatically.