What is the lenght from the center of a circle to the outside

The line from the center of the circle to the outside is called the radius

Assuming that the question you're asking is:
What is the length from the center of a circle to the outside called?

It's called a radius

Center to outside = RADIUS
Straight line from one side to another = either arch or DIAMETER
Distance around the circle = CIRCUMFERENCE

Hope that helps and correct me if I'm wrong!

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!