eguidi Hexagonl. Let AD a and BC = 6, find CD , DE , EF and FA in terms of a and b. (4 marks) (b) PQRST is a regular pentagon having sides of unit length. Let PQ = p, QR = q and RS = r, express r in the form Ap + uq. Find ) and u in terms of y, where y = p . q. (8 marks) 2. Forces of magnitude P, Q and R act along the sides BC, CA and AB, of a triangle ABC and