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Find the perimeter of the adjoining figure, which is a semicircle including its diameter.
"
Diameter$=10\ cm$
$r=\frac{10}{2}\ cm$
$=5\ cm$
The perimeter of a semicircle$=\pi r$
$=\frac{110}{7}cm+diameter$
$=\frac{110}{7}\ cm+10\ cm$
$=(\frac{110+70}{7})\ cm$
$=\frac{180}{7}\ cm$
$=25.71\ cm$
Hence the required perometer$=25.7\ cm\ (approx.)$
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