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How do I calculate the area of the triangle BDE? It should have two cases. When the point E is betwe
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How do I calculate the area of the triangle BDE? It should have two cases. When the point E is between the CDs, I have already calculated the area at this time, but when the point E is on the extension line of the CD, how should the area be determined? I have no idea.
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For your registration , I think you must wait until you receive a second email .
For the aera , its depend on position of point C . See joined file .
If you draw the triangle BDE, GeoGebra automatically shows its area in Algebra View.
https://wiki.geogebra.org/e...
If you need to calculate this area algebraically, choose a base for the triangle, (possibly the one you already know the equation of the line which contains it) and calculate its height by using the distance pointline formula
abs(a x0 +by0 +c)/sqrt(a^2 + b^2),
where the line containing the base has equation ax+by+c=0 and the point has coordinates (x0, y0).
I like to use the formula for the volume of an ndimensional simplex. In your case:
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