An angle subtended at the semicircular arc is 90 degrees.
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It is a right angle.
the angle with a value from 90 degree-180 degree
The area is 0.5*pi*r2 where r is the radius. The angle is totally irrelevant since it will always by 180 degrees for a semicircle!
Yes
the angle on a straight line is 180 degrees, the angle of semicircle at centre is 180 degrees