# Area of a triangle with three points Calculator

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

Area of a triangle with three points

[1-8] /8 | Disp-Num |

- 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.

[1] 2022/05/21 14:11 50 years old level / Others / - /

- Purpose of use
- Check answer.

[2] 2022/03/11 16:08 Under 20 years old / High-school/ University/ Grad student / Useful /

- Purpose of use
- checking my answer when using that matrix formula thing

[3] 2021/05/31 14:00 Under 20 years old / High-school/ University/ Grad student / Useful /

- 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.

[4] 2021/05/31 13:19 Under 20 years old / A teacher / A researcher / A little /

- Purpose of use
- checking answers on homework
- Comment/Request
- teacher didn't show me this formula

[5] 2021/05/18 18:57 Under 20 years old / High-school/ University/ Grad student / Useful /

- Purpose of use
- my idiot teacher didn't show us the formula
- Comment/Request
- it works really well

[6] 2021/05/17 22:56 Under 20 years old / High-school/ University/ Grad student / Very /

- Purpose of use
- Corroborate the area of a triangle given by locations.

[7] 2020/12/01 16:11 20 years old level / An engineer / Useful /

- Purpose of use
- help on homework demo
- Comment/Request
- no

[8] 2020/05/06 18:50 Under 20 years old / Elementary school/ Junior high-school student / Useful /

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