Book Maths Puzzle Numerical Ability

the coordinate of one end of diameter of a circle are (5,-7). If coordinates of the centre is(7,3) find the coordinate of the other side of the circle

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The other co ordinates are (9,13).
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Book Other Question

the angles of a triangle are in ratio 2:3:7 find the measure of the largest angle find the coordinates of the point which divides the line segment joining the points (5,-2) (9,6) internally in ratio 1:2