38° tangent B A, B and C are points on a circle, centre O. (i) Write down the mathematical name of the line BC. NOT TO SCALE .cat..angles....... [1] (ii) Draw a tangent to the circle at point B. [1] (!!!) Give a geometrical reason why angle ACB=90°. semicircle Angle.in.....13.90° (iv) The area of the circle is 245.5 cm². Calculate the length of AB. [1] E​