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Area of semi circle = π r² /2

⇒π r² /2 = 308

⇒ r² =616/π

=196

so,**radius, r = 14 cm**

now perimeter = 2π r/2 = π r

=π ×14

= 44 cm

**∴perimeter = 44 cm**

⇒π r² /2 = 308

⇒ r² =616/π

=196

so,

now perimeter = 2π r/2 = π r

=π ×14

= 44 cm