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In the figure AB is the chord of a circl...

In the figure AB is the chord of a circle with centre O and DOC is a line segment such that `BC=DO`. If `/_C=20^(@)`, find angle AOD.

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The correct Answer is:
`60^(@)`
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ICSE-TANGENTS AND INTERSECTING CHORDS-EXERCISE 18 (C)
  1. Prove that the circle drawn on any one of the equal sides of an iso...

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  2. Bisectors of vertex angles A, B and C of a triangle ABC intersect its ...

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  3. In the figure AB is the chord of a circle with centre O and DOC is a l...

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  4. Prove that the perimeter of a right triangle is equal to the sum of th...

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  5. . Prove that the tangent drawn at the mid-point of an arc of a circle ...

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  6. In the given figure, MN is the common chord of two intersecting circle...

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  7. In the given figure, ABCD is a cyclicquadrilateral, PQ is tangent to t...

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  8. The given figure shows a circle with centre O and BCD is tangent to it...

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  9. ABC is a right triagle with angle B=90^(@) . A circle with BC as diame...

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  10. In the given figure AC=AE Show that (i) CP=EP (ii) BP=DP

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  11. ABCDE is a cyclic pentagon with centre of its circumcircle alt point O...

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  12. In the given figure O is the centre of the circle. Tangents at A and B...

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  13. ABC is a triangle with AB=10cm, BC=8cm and AC=6cm (not drawn to scale)...

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  14. The given figure shows a semi circle with centre O ane diameter PQ. If...

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  15. The given figure shows a circle with centre O such that chord RS is pa...

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  16. In the given figure PAT is tangent to the circle with centre O, at poi...

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  17. AB is a line segment and M is its mid point. Three semi circles are dr...

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  18. TA and TB are tangents to a circle with centre O from an external poin...

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  19. Two circles intersects in points P and Q. A secant passing through P i...

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  20. Prove that the any four vertices of a regular pentagon are concyclic (...

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