book Maths Puzzle Numerical Ability

c= circumfernce d= diameter r= radius pie= 3.14 or 22/7

c= 44 meters
what is the radius
formula c=2*3.14*r
i do not know the answer

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book Other Question

How do show square root of 3 on a number line using the pythagoras theorem? Solve the following equations:

a)2^3x-1=1/128 b) ln(4x-3)=1