book Maths Puzzle Numerical Ability

Diameter of a circle. If the diameter of a circle is 1.3 X 10^-12 meters, then what is its radius?

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an algebra teacher stated that 2x+1=1 5=2x=14 are equivalent. what was done to the first equation to get the second equation? what is the value of x that makes both equations equal? If I have a triangle with one side equalling 8 feet, another side equalling 12 feet, and I have to find the third side (which is the longest), what do I do?