Points A, C and D lie on a circle with center O. BA & BC are tangents to the circle | Circle theorem

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This video explains an example from "Circle Theorem".

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Points A, C & D lie on a circle with center O.
BA & BC are tangents to the circle.
Angle ABC = 32° and angle DAB = 143°.

00:24 - (i) Calculate angle AOC in quadrilateral AOCB.
02:10 - (ii) Calculate angle ADC.
04:06 - (iii) Calculate angle OCD.
05:51 - (iv) OA = 6 cm. Calculate the length AB.

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Note : The question is referred from CIE IGCSE October / November 2012 Paper 4 (Extended), 0580/42/O/N/12 for educational purpose only.
  1. Mathnetics by SRS
  2. mathnetics
  3. circles
  4. circle theorem
  5. igcse
  6. igcse math
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