Question 1073273
*[illustration d1.png].
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{{{x^2+4^2=R^2}}}
{{{(x+1)^2+3^2=R^2}}}
So,
{{{x^2+16=(x+1)^2+9}}}
{{{x^2+16=x^2+2x+1+9}}}
{{{x^2+16=x^2+2x+10}}}
{{{2x=6}}}
{{{x=3}}}
So,
{{{3^2+4^2=R^2}}}
{{{9+16=R^2}}}
{{{R=5}}}
{{{D=2(5)}}}
{{{D=10}}}{{{cm}}}