Find the volume of the hemisphere shown. remember is half of a sphere.? R=5?

Lexis love

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Find the volume of the hemisphere shown. remember is half of a sphere.?
R=5
here is my answer is the answer correct or not?? :

4/3 x Pi x radius cubed.

SO, five cubed is 125.

(4/3) x pi x 125 = 523.6 (approx).

One half of that is 261.8.
answer: 261.8

right???? or not????
i really dont no its asked the way i wrote it Find the volume of the hemisphere shown. remember is half of a sphere. i guess it correct then
 
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