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abruzzese [7]
3 years ago
11

Find the perimeter of a semi circle whose diameter is 21cm​

Mathematics
1 answer:
Gala2k [10]3 years ago
4 0

Answer:

<h3>\boxed{ \boxed{ \bold{  \purple{16.485 \: cm}}}}</h3>

Step-by-step explanation:

Diameter ( d ) = 21 cm

Radius is just half of the diameter

Radius ( r ) = \sf{ \frac{21}{2} } = 10.5 cm

Now, let's find the perimeter of a semi - circle :

\sf \frac{1}{2} \pi \: r \:

Plug the values

⇒\sf{ \frac{1}{2}  \times 3.14 \times 10.5}

Calculate

⇒\sf{16.485 \: cm}

Hope I helped!

Best regards!

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