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get off of me i'm a circle not a circle with a line through it
A circle does not have any points. The circle is completely rounded off.
DA-Decision Altitude. It is the lowest an aircraft can fly on an (precision) instrument approach. At that height the pilot must be able to see the runway or landing light system or else he has to initiate a missed approach
The diameter of a circle is twice its radius and spans the circle passing through its centre.
It is called a semicircle.