Math coordinate geometry question help!?

Posted on 2017-12-13 18:46:00 in Math by SARHA

The diagram shows the quadrilateral ABCD. The coordinates of A and of B are ( -3a, 4a+1), where a >0, and (0,1) respectively. C and D lie on the x-axis. A straight line from D bisect AB perpendicularly at M. The length of AB is 5 units. 
a) A straight line drawn from the y-axis cuts C bisects angle BCD. Find the equation of this straight line. 
b) A circle is drawn on the 2nd quadrant such that the points A, M and D lie on its circumference. Find the area of the circle​

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