Find the perimeter of a semi circle whose diameter is 21cm
1 answer:
Answer:
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Step-by-step explanation:
Diameter ( d ) = 21 cm
Radius is just half of the diameter
Radius ( r ) =
= 10.5 cm
Now, let's find the perimeter of a semi - circle :

Plug the values
⇒
Calculate
⇒
Hope I helped!
Best regards!
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Answer:x=-20
Step-by-step explanation:
Πr^2=area 9=r 9^2=81π=254.47