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# In a $\Delta$le ABC let $\angle C=\large\frac{\pi}{2}$ if $r$ is the radius and R is the circumference of the $\Delta$le ABC then $2(r+R)$ equals

$(a)\;c+a\qquad(b)\;a+b+c\qquad(c)\;a+b\qquad(d)\;b+c$

$\angle C=\large\frac{\pi}{2}$