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It is 90 degrees between the circle's diameter and its tangent
For a circle where sector measures 10 degrees and the diameter of the circle is 12: Sector area = 3.142 square units.
360 degrees * * * * * That is a nonsensical answer. The diameter of a circle is a straight line segment, going from the circumference of the circle, through the centre, to the circumference on the other side.
A diameter of a circle is twice the length of a radius. Think of a diameter as two radii, both originating at the center of the circle and extending out at 180 degrees to each other to reach the edge of the circle. In this example, if the radius is 1.5, the diameter would be 3.
A circle has 360 degrees around it.