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Area of a triangle

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erpriyankabishnoi
 Post subject: Area of a triangle
 Post Posted: Fri Aug 26, 2011 1:49 pm 
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Course Students


Posts: 117
Area of a triangle given the three vertices of the triangle (x1, y1 ), (x2, y2 ) and (x3, y3 )

Area = 1/2 * (x1*(y2-y3) + x2 *(y3-y1) x3*(y1-y2))

Can we use this equation to find the area of a triangle always?
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adiagr
 Post subject: Re: Area of a triangle
 Post Posted: Fri Aug 26, 2011 3:43 pm 
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Students


Posts: 89
erpriyankabishnoi wrote:
Area of a triangle given the three vertices of the triangle (x1, y1 ), (x2, y2 ) and (x3, y3 )

Area = 1/2 * (x1*(y2-y3) + x2 *(y3-y1) x3*(y1-y2))

Can we use this equation to find the area of a triangle always?


While formula is correct, GMAT will seldom ask formula based questions. Study equilateral and isosceles triangle property along with key properties of a right angled triangle......That should be sufficient....

Aditya
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jnelson0612
 Post subject: Re: Area of a triangle
 Post Posted: Wed Sep 28, 2011 4:48 pm 
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ManhattanGMAT Staff


Posts: 1857
adiagr wrote:

While formula is correct, GMAT will seldom ask formula based questions. Study equilateral and isosceles triangle property along with key properties of a right angled triangle......That should be sufficient....

Aditya


I agree with this. Do know the 30-60-90 and 45-45-90 triangle theorems also, as well as pythagorean theorem.

_________________
Jamie Nelson
ManhattanGMAT Instructor
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