21.If two circles intersect at two points, prove that their centres lie on the perpendicular bisector of the common chord.
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22.In figure, EF is a line passing through the centre O of a circle. If EF bisects chords AB and CD of the circle, prove that AB || CD.
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23.Two chords PQ and RS of a circle are parallel to each other and AB is the perpendicular bisector of PQ. Without using any construction, prove that AB bisects RS.
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24.OD is perpendicular to chord AB of a circle whose centre is O. If BC is a diameter, prove that CA = 2OD.
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25.In the figure, diameter AB and a chord AC have a common end point A. If the length of AB is 20 cm and of AC is 12 cm, how far is AC from the centre of the circle?
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26.Bisector AD of ∠BAC of ∆ABC passes through the centre of the circumcircle of ∆ABC as shown in the figure. Prove that AB = AC.
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27.How will you complete an arc of a circle?
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28.Find the length of a chord which is at a distance of 3 cm from the centre of a circle whose radius is 5 cm.
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29.Two concentric circles are with centre O. A, B, C, D are the points of intersection with a line. If AD = 12 cm and BC = 8 cm, find the length of AB, CD, AC and BD.
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