Q1 of 256 Page 7

Find the area of the triangle with vertices at the points:

(3, 8), (– 4, 2) and (5, – 1)

Given: – Vertices of the triangle:


(3, 8), (– 4, 2) and (5, – 1)


We know that,


If vertices of a triangle are (x1,y1), (x2,y2) and (x3,y3), then the area of the triangle is given by:



Now, substituting given value in above formula



Expanding along R1





sq.units


Thus area of triangle is sq.units


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Find the area of the triangle with vertices at the points:

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