Find the area of the triangle PQR formed by joining the midpoints of the sides of the triangle whose vertices are A(1,-2),B(3,2)C(-1,4).also find the triangle ABC
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Area of triangle = 
=1/2[1(2-4)+3(4-(-2)-1(-2-2)]
=1/2[1(-2)+3(4+2)-1(-4)]
=1/2(-2+3(6)+4)
=1/2(-2+18+4)
=1/2(-2+22)
=1/2(20)
=10
4.0
=1/2[1(2-4)+3(4-(-2)-1(-2-2)]
=1/2[1(-2)+3(4+2)-1(-4)]
=1/2(-2+3(6)+4)
=1/2(-2+18+4)
=1/2(-2+22)
=1/2(20)
=10
4.0
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