Answer : The volume of shaded figure is,
![791.28ft^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/mcl7i4j43i9x8dzz6a6rzrgfof0nybntz8.png)
Step-by-step explanation :
First we have to calculate the volume of small sphere.
Formula used :
![V_1=(4)/(3)\pi r^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/xne40tnnt67l8h08cvbrq6hfyu00fijnky.png)
where,
= volume of small sphere
r = radius of small sphere = 3 ft
Now put all the given values in the above formula, we get:
![V_1=(4)/(3)* 3.14* (3)^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/w56uobliuyqx3n0mul5erfnivjwgou3vkx.png)
![V_1=113.04ft^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/f61vqo6xik6a2mhguxjxqomv028tokpstj.png)
Now we have to calculate the volume of larger sphere.
Formula used :
![V_2=(4)/(3)\pi r^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/imofxpl03tzi20it3bpv3qr13ouafg5isz.png)
where,
= volume of larger sphere
r = radius of larger sphere =
![(\Diameter)/(2)=(12ft)/(2)=6ft](https://img.qammunity.org/2020/formulas/mathematics/middle-school/6ilg9cemr72im6h5wxgonls326e2ylfuky.png)
Now put all the given values in the above formula, we get:
![V_2=(4)/(3)* 3.14* (6)^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ip46r5xywznik72vdnkcxm0hj0y7vvc5ql.png)
![V_2=904.32ft^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/2i3zyxn6il1aeitl8ga9n8zfyxj0ru0k3u.png)
Now we have to calculate the volume of shaded figure.
Volume of shaded figure = Volume of larger sphere - Volume of smaller sphere
Volume of shaded figure =
![904.32ft^3-113.04ft^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/6sfa25o24579m8sqzkht3ngrmjflb29xvs.png)
Volume of shaded figure =
![791.28ft^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/mcl7i4j43i9x8dzz6a6rzrgfof0nybntz8.png)
Therefore, the volume of shaded figure is,
![791.28ft^3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/mcl7i4j43i9x8dzz6a6rzrgfof0nybntz8.png)