exam Maths Puzzle Numerical Ability

i have to use the midpoint formula and i have the midpoint and one end and i have to find the other end

ex) A------B------C
(2,-3) (-5,1) (?)

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how do i solve this please explaon!!!!!!! i have a test on tuesday and its already saturday and i dont know how to do it Here's the question.
A rectangle is bounded by the x-axis and the semicircle y= Square root of 36-x Squared. Write the Area A of the rectangle as a function of x, and determine t