Maths Revisio

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What is the equation to work out the Circumference of a Circle? Circumference = (Pie) X Diameter *C=Pd*
What is the equation to work out the Area of a Circle? Area = (Pie) X r *Radius * X r *Radius* *A=Prr* or r2 *squared*
What is the equation to work out the Rea of a Trapezium? a + b / 2 x height *a is the length of the top line, b is the bottom line*
What is the equation to work out the Rea of a Triangle? b x h / 2 *base times height divided by two*