Area of a circle - ℿr2, Circumference of a circle - ℿd, Area of a quarter circle - ℿr2/4, Perimeter of half circle - ℿd / 2 + d, Area of a trapezium - 4 + 6 /2 x5, Area of a triangle - 6 x 4 /2, Pythagoras triangle - 3cm 4cm 5cm, Pythagoras: find the shortest side - c2 - b2 = a2, Area of a half circle - 3.14 x 62 / 2, Perimeter of an isosceles triangle - 6 + 6 + 4,

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