WAEC - Mathematics (2002 - No. 30)
In the diagram O is the centre of the circle. Which of the following is/are not true? I. a = b II. b + c = 180o III. a + b = c
I and II only
II and III only
II only
III only
Explanation
i.a and b are 90( angles in same segment are equal)
ii. angle b+c=180 (opposite angles in a cyclic quadrilateral)
iii. a=90 and b=90 .:a+b=180 which is not equal to c
ii. angle b+c=180 (opposite angles in a cyclic quadrilateral)
iii. a=90 and b=90 .:a+b=180 which is not equal to c
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