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# Quadrilateral irregular shape area watch

1. https://imgur.com/a/ICjq4

Answer is 40 but I don't get where this comes from which can be done under 5 minutes which im sure the mark of the question would be.
2. First you need to check whether your DB really bisects AC. (I don't think it does). Then you can proceed via the areas of the right angled triangles AOB and ODB to find the area of half the quadrilateral.
3. (Original post by old_engineer)
First you need to check whether your DB really bisects AC. (I don't think it does). Then you can proceed via the areas of the right angled triangles AOB and ODB to find the area of half the quadrilateral.
It is a perpendicular bisector doesn't that mean it does? That is also how I found the points I had to find.
4. (Original post by ckfeister)
It is a perpendicular bisector doesn't that mean it does?
Is the point at which your DB crosses AC half way between A and C?
5. (Original post by old_engineer)
Is the point at which your DB crosses AC half way between A and C?
Did you even read the question?

The perpendicular bisector of the line joining A (0,1) and C (4,-7) intersects the x-axis at B and y-axis at D. Find the area of the quadrilateral ABCD
6. (Original post by ckfeister)
Did you even read the question?

The perpendicular bisector of the line joining A (0,1) and C (4,-7) intersects the x-axis at B and y-axis at D. Find the area of the quadrilateral ABCD
Carry on then.
7. (Original post by old_engineer)
Carry on then.
Thanks for the help

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