kindly help me to solve this equation

how he calculated vlue of d to be 16.1

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- February 24th 2011, 07:19 AMmoonnightingalehow value of d is calculated in this equation
kindly help me to solve this equation

how he calculated vlue of d to be 16.1 - February 24th 2011, 08:17 AMharish21

Therefore, you have:

squaring both sides gives you:

the terms cancel each other out and simplification gives you the value of d.