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J1. Properties of a circle : the angle in a semicircle. Draw a circle Draw a diameter (which will split the circle into two semicircles). Choose a point anywhere on the circumference Join this point to the ends of the diameter The angle formed will be a right-angle. The angle will always be a right-angle regardless of the size of the circle or where the diameter is drawn or where the point on the circumference is chosen. Therefore... The angle in a semicircle is a right-angle. Change the size of the circle and where the diameter is drawn and where the point is chosen on the circumference. The angle in the semicircle remains a right angle.