JAMB - Mathematics (2010 - No. 10)

From the diagram above, find x

65^o

50^o

75^o

55^o

∠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