YES
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IGCSE maths is allot more difficult then GCSE maths and so is any grade you wish to obtain. A C grade at GCSE is roughly 35% whilst at GCSE is 60%
A relation is any set of ordered pairs.A function is a relation in which each first element corresponds to exactly one second element
A chord is a straight line joining any 2 points on the circumference of a circle
I am not aware of any special meaning in math. In physics, it is short for pascal, a unit of pressure.
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