# Area of a triangle

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Luffy on 14 Jun 2012
Answered: AYUSH MISHRA on 26 May 2020
Is there a function to find area of triangle,not by using Heron's algorithm.

Dr. Seis on 14 Jun 2012
>> x = [0, 0, 4];
>> y = [0, 3, 0];
>> area1 = polyarea(x,y)
area1 =
6
>> area2 = 0.5*3*4
area2 =
6

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Walter Roberson on 20 Jun 2012
Triangles only _have_ 2D area.
Perhaps you are asking about finding the area of a triangle when the coordinates are specified in 3D ?
Luffy on 22 Jun 2012
My mistake in writing 2D area, i meant what if u have coordinates in 3D.
Example:- area of triangle with coordinates as (1,0,0)(0,1,0)(0,0,1) without using heron's algorithm
Dr. Seis on 22 Jun 2012
I think you would have to do some sort of coordinate transform (to still use the "polyarea" function above), such that all the coordinate values for one of the dimensions (e.g., the z-coordinate) are 0. But it seems using Heron's algorithm would be much easier.

SaN AruL on 25 Nov 2016
thank you Dr. Seis..........

AYUSH MISHRA on 26 May 2020
function area=tri_area(b,h,n)
area=0.5*b*h*n;
end
%Here b=base of triangle , h=height of triangle , n=number of triangle
Example
area= tri_area(2,3,5)
area =
15