How do you find the angle with 3x?

To find the angle represented by (3x), first, you need to know the value of (x). If you have an equation or context where (x) is defined, substitute that value into (3x). For example, if (x = 20^\circ), then (3x = 3 \times 20^\circ = 60^\circ). If additional information is provided (like the sum of angles in a polygon), you can use that to solve for (x) first.