Respuesta :

Answer:

[tex]C\text{ = }\pi r[/tex]

Explanation:

Formula for calculating the circumference of a circle is expressed as;

[tex]C\text{ = 2}\pi r[/tex]

r is the radius

Since a semi-circle is half of a circle, then the circumference will be half of cirumference of a circle as shown;

[tex]\begin{gathered} C\text{ = }\frac{2\pi r}{2} \\ C\text{ = }\pi r \end{gathered}[/tex]

This gives the circumference of s semicircle where r is the radius of the semi circle

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