Question

Find the area of the triangle whose vertices are : (2,3), (-1,0), (2,-4)

Answer 1

area of triangle=1/2 [{2 (0+4)}+{(-1 )(-4-3)}+{2 (3-0)]
=1/2 (8+7+6)
=1/2×21
=21/2

Answer 2

Hey friend !

Here's your answer.

formula -

1/2 [ x1 (y2-y3) + x2 (y3-y1) + x3 (y1-y2) ]

1/2 [ 2 (0+4) + (-1) (-4-3) + 2 (3-0)

1/2 (8 + 7 + 6)

21/2 square units
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Hope this helps !