exam Maths Puzzle Numerical Ability

how would this be solved :

1)Find the area of a rectangle if three of its corners are (-0.1,-3.4), (-7.9,-3.4), and (-0.1,6.8).

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exam Other Question

suppose you mark 10 points on a line.How many line segments have two of these points as endpoints? Given just the slop of two lines, how can I tell if they lines are perpendicular? Parallel?