# Area of a triangle with three points Calculator

## Calculates the area and boundary length of a triangle with three points.

 point A (x1 ,y1) point B (x2 ,y2) point C (x3 ,y3) 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit area S boundary length L
Area of a triangle with three points
 [1-8] /8 Disp-Num5103050100200
[1]  2022/05/21 14:11   50 years old level / Others / - /
Comment/Request
For the area equation, just subtract x3 from each of the x coordinates and subtract y3 from each of the y coordinates. This shifts the triangle to the origin. Now the area equation becomes:
(x1y2-x2y1)/2
and it's now a lot easier to remember and to calculate.
[2]  2022/03/11 16:08   Under 20 years old / High-school/ University/ Grad student / Useful /
Purpose of use
[3]  2021/05/31 14:00   Under 20 years old / High-school/ University/ Grad student / Useful /
Purpose of use
checking my answer when using that matrix formula thing
[4]  2021/05/31 13:19   Under 20 years old / A teacher / A researcher / A little /
Purpose of use
Refresh
Comment/Request
Teachers do not care about the area of a triangle. Teachers do care about how to calculate the area of triangle. This formula is useful, but it is not its point to replace the basic understanding of height times base. Regarding comment from 18.05.21: Only an idiot student may think a teacher is an idiot.
[5]  2021/05/18 18:57   Under 20 years old / High-school/ University/ Grad student / Useful /
Purpose of use
checking answers on homework
Comment/Request
teacher didn't show me this formula
[6]  2021/05/17 22:56   Under 20 years old / High-school/ University/ Grad student / Very /
Purpose of use
my idiot teacher didn't show us the formula
Comment/Request
it works really well
[7]  2020/12/01 16:11   20 years old level / An engineer / Useful /
Purpose of use
Corroborate the area of a triangle given by locations.
[8]  2020/05/06 18:50   Under 20 years old / Elementary school/ Junior high-school student / Useful /
Purpose of use
help on homework demo
Comment/Request
no

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