It is the smaller of the 2 part divided between 2 radii
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Not necessarily. Only if the minor arc is less than 1/4 of the circle. If the minor arc is more than 1/4 of the circle, then the central angle is obtuse.
No. Given two points on a circle, the minor arc is the shortest arc linking them. The major arc is the longest.
The circumference of a circle is 360 degrees. The circumference of a circle is also 2*pi*radius or diameter*pi.
No, because there is no acute angle in a circle.
The total circumference of the circle is (2 pi R) = 30 pi.The central angle of 90° is 90/360 = 1/4 of the circle.The minor arc = 30 pi/4 = 23.562 (rounded)