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Triangle

Triangle analytical geometry.

Triangle - centroid co-ordinates and area

Centroid of Triangle

The centroid of a triangle in a co-ordinate system can be expressed as

x s = (x1 + x2+ x3 ) / 3                        (1)

y s = (y1 + y2+ y3 ) / 3                        (1b)

Area of Triangle

The area of the triangle can be expressed as

A = | ((x1 y2- x2y1 ) + (x2y3 - x3 y2) + (x3 y1 - x1 y3 )) / 2 | (2)

Triangle Calculator

Triangle Calculator
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Centroid
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Example - Centroid and Area of Triangle

The centroid of a triangle with points P1 (0,0), P2(1,1) and P3 (1,0.5) can be calculated as

x s = (0 + 1 + 1 ) / 3

= 0.67

y s = (0 + 1 + 0.5) / 3

= 0.5

The area can be calculated as

A = | ((0 1 - 1 0) + (1 0.5 - 1 1) + (1 0 - 0 0.5)) / 2 |

= 0.25

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