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WAEC Mathematics 2012 Paper
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© africaexams.com
Question : 45
Total: 49
The diagram is a circle with centre P. PRST are points on the circle. Find the value of < PRS
144
o
72
o
40
o
36
o
Validate
Solution:
Reflex < POS = 2x (angle at centre is twice that at circumference)
reflex < POS + < POS = 350
o
(angles at a point)
i.e. 2x + 8x = 360
o
10x = 360
o
x =
360
10
= 36
o
< PRS =
1
2
< POS(< at centre twice that circumference)
=
1
2
x 8x = 4x
4 x 36
o
< PRS = 144
© africaexams.com
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