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In following figure, two congruent circles have centres O and O′. Arc AXB subtends an angle of 75° at the centre O and arc A′ Y B′ subtends an angle of 25° at the centre O′. Then the ratio of arcs A X B and A′ Y B′ is

1:33:11:22:1

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In following figure, AB and CD are two equal chords of a circle with centre O. OP and OQ are perpendiculars on chords AB and CD, respectively. If ∠POQ = 150°, then ∠APQ is equal to

60°15°75°30°

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AD is a diameter of a circle and AB is a chord. If AD = 34 cm, AB = 30 cm, the distance of AB from the centre of the circle is

8 cm4 cm15 cm17 cm

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In following figure, if OA = 5 cm, AB = 8 cm and OD is perpendicular to AB, then CD is equal to:

5 cm4 cm3 cm2 cm

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If AB = 12 cm, BC = 16 cm and AB is perpendicular to BC, then the radius of the circle passing through the points A, B and C is:

12 cm10 cm8 cm6 cm

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In following figure, if ∠ABC = 20º, then ∠AOC is equal to:

10°60°40°20°

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In following figure, if AOB is a diameter of the circle and AC = BC, then ∠CAB is equal to:

45°90°60°30°

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In following figure, if ∠OAB = 40º, then ∠ACB is equal to:

70°60°40°50°

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In following figure, if ∠DAB = 60º, ∠ABD = 50º, then ∠ACB is equal to:

80°70°50°60°

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ABCD is a cyclic quadrilateral such that AB is a diameter of the circle circumscribing it and ∠ADC = 140º, then ∠BAC is equal to:

30°40°50°80°

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In following figure, BC is a diameter of the circle and ∠BAO = 60º. Then ∠ADC is equal to:

120°60°45°30°