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Put the numbers in a column with the decimal points aligned. Add the numbers ignoring the decimal points. Insert the decimal point in the answer exactly below the column of decimal points in the numbers being added (summands).
sphere
a line segment is a part of a line that is bounded by 2 end points, and contains every point on the line between its end points
A line segment is a part of a line that is bounded by two end points, and contains every point on the line between its end points.
Working in degrees, the angle of the greater radius, minus the lesser radius, all over 360, gives the proportion of the area of the circle that is bounded by the radii. This can then be multiplied by the area of the whole circle to give the bounded area.