Maths Revisio

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1. 
What is the equation to work out the Circumference of a Circle?
 
Circumference = (Pie) X Diameter *C=Pd*
 
2. 
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*
 
3. 
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*
 
4. 
What is the equation to work out the Rea of a Triangle?
 
b x h / 2 *base times height divided by two*