Question

can this formula can be used every time to find the fourth vertex or third vertex in a rectangle or triangle or rohombus or sclane trianlgle etc..
x1-x2+x3 , y1-y2+y3

Answer 1

No,

x1 the x-coordinate of the first vertex

y1 the y-coordinate of the first vertex

x2 the x-coordinate of the second vertex

y2 the y-coordinate of the second vertex

x3 the x-coordinate of the third vertex

y3 the y-coordinate of the third vertex

Answer 2

Answer:

No. If a quadrilateral is given, then you must join 2 vertices. Then you get 2 triangles. You can use the area formula 2 times to get the areas. After finding the areas, add them so that you get the area of the whole quadrilateral. This formula can be commonly used to find area of any type of triangle.

hope this helps u..