A shuttlecock used for playing badminton has the shape of a frustum of a cone mounted on a hemisphere as shown in the figure. The external diameters of the frustum are
5cm and
2cm, the height of the entire shuttlecock is
7cm. Find its external surface area.
![1011061_c0c210cf047f40e08769211355e5da16.png](https://search-static.byjusweb.com/question-images/toppr_invalid/questions/1011061_c0c210cf047f40e08769211355e5da16.png)