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.]