Find the diameter of the circle if you know it is 65mm larger than the radius.

From the school geometry course, we know that the radius is half of the diameter, that is, the following expression can be written:

D = 2r.

Let us find out what value will correspond to the length of the diameter of the indicated circle, when it is precisely known from the condition of our problem that it exceeds the radius by 65 millimeters:

2r – r = 65;

r = 65;

2 * 65 = 130.

Answer: Under such initial conditions, the diameter of the indicated circle will be 130 millimeters.