How do I make these circles with radius in sketch?

Question

I am trying to make the following effects in sketch. As presented in the picture, they seem to have a curved and border radius cut to their ends.

Answer 1

To create arc we need Scissors tool.

First, create oval with no fill and desired border color.

Select Edit tool and place point on oval where you want to be arc's end

Then select Scissors tool

Hover over the oval and cut unnecessary parts of oval

At the end select desired ends of the resulting arc by clicking gear icon on Borders tool.

In that way you can create any arcs, combine them and get desired result.

You can download sketch file here

Answer 2

Sketch is a bit primitive, all jokes and puns aside.

The easiest way, make an arc, give it the width you want, then place a small circle at each end, in the same size as your width. Cheating, but... well, pretty much everything is a cheat, in graphics.