The area of a triangle with vertices (a, b + c), (b, c + a) and (c, a + b) is
12 sq.units
(a + b + c)2
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The area of a rhombus whose vertices are (3, 0), (4, 5), (-1, 4) and (-2,-1) taken in order, is:
Franz looked for opportunities to skip school to do what?