The length of the diagonal of a square is 12 cm. Calculate the area of the square.

 In the diagram above, O is the centre of a circle NST. |NT| = |ST| and ∠NTS = 36°. Find the measure of the angle marked t.

 Find the value of m in the diagram above.

Find the gradient of the line passing through the points \((\frac{1}{2},  \frac{- 1}{3})  and  ( 3 , \frac{2}{3})\)

A notebook of length 15 cm was measured to be 16.8 cm, calculate, correct to two d.p, the percentage error in the measurement.