If you add all of the angles of a triangle together, it will always be 180 degrees. So we can use that to find the answer.
First of all, let's add the angles we already have.
47 + 59 = 106
But we want to find the last angle. So now we subtract 106 and 180(remember to put the bigger number first).
180 - 106 = 74
The last angle of the triangle is 74 degrees.