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From the diagram above find x - JAMB Mathematics 2010 Question

From the diagram above, find x
A
65o
B
50o
C
75o
D
55o
correct option: a

∠RTS = 90o (∠ in semi circle)

∠UTS = 25o (∠ in alternate segment)
X + 90 + 25 = 180(sum of ∠s on a str line)
X + 115 = 180
X = 180 - 115
X = 65o

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