SOLUTION: how do you find the perimeter and area of a polygon with 4 vertices?

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Question 1045593: how do you find the perimeter and area of a polygon with 4 vertices?
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
how do you find the perimeter and area of a polygon with 4 vertices?
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Depends on the shape and the info you're given.

Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
.
If it is a convex quadrilateral, you can divide it by some its diagonal in two triangles and then find the area of the quadrilateral
as the sum of areas of the two triangles.

There are other methods, too.
See the lessons
    - Area of a parallelogram
    - Area of a trapezoid
    - Area of a quadrilateral
    - Area of a quadrilateral circumscribed about a circle
    - Area of a quadrilateral inscribed in a circle
    - Solved problems on area of parallelograms
    - Solved problems on area of rhombis, rectangles and squares
    - Solved problems on area of trapezoids
    - Solved problems on area of quadrilaterals
in this site.

Also,  you have this free of charge online textbook in Geometry
    GEOMETRY - YOUR ONLINE TEXTBOOK
in this site.