Posted by **Thomas** on Sunday, May 23, 2010 at 11:13pm.

A triangle has verticies A(-2.1,3), B(7,8,-4), and C(5,0,2). Determine the area of triangle ABC.

- CALCULUS -
**Joe**, Monday, May 24, 2010 at 12:12am
This is actually a question from co-ordinate geometry. If (x1,y1), (x2,y2) and (x3,y3) are the vertices of a triangle then its area = (1/2))(x1(y2-y3)+x2(y3-y1)+x3(y1-y2))

The co-ordinates of the vertices aren't very clear in your Q but assuming that the three points are (-2.1,3),(7.8,-4)& (5,0.2) the area of the triangle is 10.99 sq. units

Ajit

## Answer this Question

## Related Questions

- math - B . . . . . . . . . . . . . . C A Triangle ABC is right angled at A. The...
- HELP!!!!RIGHT NOW!!!! - Which set of side lengths shows similar triangles? (1 ...
- 9th grade - given that a(-1,8) ,b(2,4) and if the line y=4 is the axis of ...
- Math - Which set of side lengths shows similar triangles? Triangle ABC : 40, 20...
- Geometry - Let ABC be any triangle. Equilateral triangles BCX, ACY, and BAZ are...
- math - Let P and Q be the points on the sides AB and BC of a triangle ABC ...
- Geometry - Given: X, Y, and Z are the midpoints of teh sides of triangle ABC. ...
- geometry - In triangle ABC, DE is parallel to AB. If DE is one-fifth AB, what is...
- geometry - The medial triangle of a triangle ABC is the triangle whose vertices...
- Math - Triangle ABC has vertices A(0,4),B(1,2),and C(4,6). Determine whether ...