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In the diagram above O is the centre of the cir... - JAMB Mathematics 2005 Question

In the diagram above, O is the centre of the circle, If < UOT = 70o and < RST = 100o. Calculate < RUO
A
20o
B
25o
C
50o
D
80o
correct option: b

< OUT = < OTU

< OUT = (\frac{180^o - 70^o}{2} = \frac{110^o}{2} = 55^o)

< RUT = 180o - 100o = 80o

< RUO = < RUT - < OUT

= 80o - 55o

= 25o

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