15. Find the total surface area of the top

The top is shaped like a hemisphere surmounted on a cone. The radius of the top is 6.9 $dm$, and the slant height is 42 $dm$. Find the total surface area of the top. [Hint: Use $\pi = \frac{22}{7}$.]

 

Answer:

 

The total surface area of the top is  $dm^2$.

 

[Note: Enter the answer up to two decimal places.]