Prove that in a circle the angle subtended by an arc at the centre is twice the angle subtended by the same arc at the remaining part of the circumference.
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180
Step-by-step explanation:
an angle subtended at the circumference by an arc us half that subtended at the center , the angles round the center are 2a and 2b . angles round a point add up to 360 so 2a + 2b = 360 .therefore a+ b = 180
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