Actual/clarified height = X = 5.5
Mistaken height = 1.25 X = 6.875
Percentage correction \(=\frac{(6.875-5.5)}{6.875}\)
\(=20\)\(\%\).So the correct option is (B)
In the figure O is the centre of the circle and A, B, C are points on the circle. AOB = 50^, BOC = 80^. 