therefore this forms an isosceles triangle inside the circle. Also, note that since triangle AOB is isosceles, then \(\angle OAB=\angle OBA\). \(\angle AOC\) is a straight angle, so will add up to ...
When a triangle is formed ... circumference at a right angle. The angle in a semicircle is a right angle of \(90^\circ\). In the diagram KL is a diameter of the circle and is 8 cm long.
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