Find the area of the triangle with vertices at the points: (i) (3, 8), (-4, 2) and (5, -1)    (ii) (2, 7),  (1, 1) and (10, 8)

Explanation

We have to find area of triangle

(i) `(3, 8), (-4, 2) and
(5, -1)  `

As we know if `A(x_1, y_1),B(x_2, y_2)a n dC(x_3,y_3)`
are vertices of a triangle

Then the area of triangle are given as:

`Delta=1/2[(x_1,y_1, 1),(x_2,y_2, 1),(x_3,y_3 ,1)]`

`Delta=1/2[(3,8, 1),(-4,2, 1),(5,-1 ,1)]`

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