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It is not.
If the half circle is on its flat side, the radius is its height. If the straight part of the half-circle is vertical, the radius is its width.
A Closed Circle means that that number is INCLUDED in the line of numbers. An OPEN circle means the line of numbers go up to the given number , BUT does NOT include the given number.
A quarter of a circle is 2/8 of a circle. Add to that an eighth (1/8) of a circle (not eight) and this equals 3/8 of a circle. This equates to 37.5 % of a circle.
its 360/15 = 24 degrees