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Maths Puzzle
Numerical Ability
1/4x - x = -15
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How do you find a formula for the area of a convex quadrilateral whose vertices are points (x1,y1),(x2,y2),(x3,y3),(x4,y4)
When the ancient Egyptians were building the great pyramids at Giza, they checked each course or level of stones to make sure they were being laid square by measuring th diagonals.