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5 steps: (1) Every triangle is half of a parallelogram/rectangle. (2) Formula: Area = (1/2) × base × height. (3) BASE: any side you choose. HEIGHT: perpendicular distance from base to opposite vertex. (4) Example: base=8cm, height=5cm. Area = (1/2)(8)(5) = 20 cm². (5) Important: the height is NOT al

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