Question no 17 & 18
Dear student
Here are links to similar queries as asked by you
https://www.meritnation.com/ask-answer/question/if-1-5-p-1-and-4-11-are-collinear-find-the-val/coordinate-geometry/7126275
https://www.meritnation.com/ask-answer/question/find-the-area-of-the-quadrilateral-whose-vertices-taken-in/coordinate-geometry/6296014
Here are links to similar queries as asked by you
https://www.meritnation.com/ask-answer/question/if-1-5-p-1-and-4-11-are-collinear-find-the-val/coordinate-geometry/7126275
https://www.meritnation.com/ask-answer/question/find-the-area-of-the-quadrilateral-whose-vertices-taken-in/coordinate-geometry/6296014