book Maths Puzzle Numerical Ability

What is the formula for finding the radius of a circle when you know the circumference?

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How do I find missing angle measures when I only have 1 angle measure such as 70 degrees or 25 degrees or 30 degrees? This is really about Properties or Axioms.....
One of my homework assignments asks me to write a convincing argument and tell why it is not necessary to state a subraction propert