Coordinate geometry in Additional Math becomes much easier when you know which formula to use. The midpoint formula helps you find the centre of a line segment by averaging the x-coordinates and y-coordinates. The gradient formula tells you how steep a line is and whether it slopes upwards or downwards. The distance formula is useful for finding the length between two points, especially when the diagram is not drawn to scale. For perpendicular lines, remember this important rule: their gradients multiply to −1. This helps in questions involving right angles. Memorizing these formulas helps you solve graph questions more confidently in tests and exams
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