For coordinate geometry, you must remember three formulas: distance √[(x₂−x₁)² + (y₂−y₁)²], section (m₁x₂+m₂x₁)/(m₁+m₂) for x-coordinate, and area of triangle ½|x₁(y₂−y₃)+x₂(y₃−y₁)+x₃(y₁−y₂)|. But beta, don't just mug up — draw a rough grid like the layout of my orchard rows; then these formulas feel obvious. I used to forget the area formula until I saw it as calculating the space between three apple trees.
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