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​7. If a point C lies between two points A and B  such that  AC=BC then prove that AC= 1 2 AB.
8 If the difference between two supplementary  angles is 40 ° Then  find the angles.
9 A chord of a  circle is equal to the radius of the  circle. Find the  angle subtended by the chord
 at a point on the major arc.
10 construct an angle  of 135 °  with ruler and compasse​

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