All important Maths formulae of 9th Class
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TriangleA = (1⁄2) × b × hP = a + b + cTrapezoidA = (1⁄2) × h × (b1+ b2)P = a + b + c + dParallelogramA = b × hP = 2 (b + h)CircleA = π r2C = 2 π r
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