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First u will find the midpoint of AB and the gradient of AB then the eq of line ABOkay. For 'Q7' I'll find the mid-point of AB than the gradient of AB and use it to find the equation of the perpendicular bisector. Can you tell how will i find the co-ordinate of D"
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w05_qp_1.pdf
then find the equation of line BC then solve simultaneously