The student's incorrect offempt We first calculate the andie at A, using the fact that al three andes in a triangle add is to BO. We Have A-80-190+231-61. and so the andhe at A is LT. Using the Sine Rule in triangle ABC, we have JnA SO sinc K SinA =9802. So the lewith of BC is 90 on Hto the nearest onl The length of BA is the same as the berwith of AR, and triande AHC is richt andded, so we have CH CHE 60423 Therefore to the nearest on, the perpendicular height of the triemile is OL-on (a) Look at the duke's anever be the bogth CH. Using what you know shend right-angled triangles, and without performing any further calculations, explain haare you know that this calculated length must be (b) There are two places in the student's attempt where a mistake has been made. Wentify these mistakes, and explain, as if directly to the student, why. for each mistake, their working is incorrect. 14 (c) Do you think that the student's approach to solving the problem is the most efficient method? Give a reason for your answer. (d) Wile out your owa solution to the probdesi, explaining your working