I need help with concatenating strings in Java (JDK 13).

Concatenate these strings using StringBuilder, rounded to three decimal places.

Disregard "df" - create a new format.

System.out.println("Side AB: "+df.format(sideAB)); System.out.println("Side BC: "+df.format(sideBC)); System.out.println("Side AC: "+df.format(sideAC));

System.out.println("The Perimeter of the triangle is : " + df.format(perimeter)); System.out.println("The Area of the triangle is : " + df.format(area));

System.out.println("The Height of the triangle is: " + df.format(height));