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Okay! Let's start sketching. First, click in the sketching tool bar. This tool defines a rectangle by two points. Place the first point at the origin (Watch for the P- symbol which shows you are placing the point at the origin point), and the other point somewhere in the first quadrant.

Now, click . This tool allows to define a circle by clicking once to define its center point, then click a distance away from the center point to define a radius. Define the circle so its center point is at the origin, define the radius by clicking somewhere inside the rectangle.

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We almost have a geometry, but we first need to get rid of the superfluous lines. In the sketching toolboxes window, click the "Modify" tab