Answer:
1328.43cm³
Step-by-step explanation:
The equation for the volume is V=(πr²h)÷3
The equation for the surface area is SA=πr²+πrl
First solve for the radius using the volume:
423πcm³=πr²+πr×9
After solving this, the 2 possible x values will be -25.55 and 16.55
Since you can't have a negative surface area, the only option will be 16.55
Now your radius is 16.55 and the slant height is 9
π(16.55)²+π(16.55)×9
The surface area will be 1328.43cm³
