2. Example Exercise II

The decorative block shown in Fig. is made of two solids  a cube and a hemisphere. The base of the block is a cube with edge $5 cm$, and the hemisphere fixed on the top has a diameter of $4.2 cm$. Find the total surface area of the block. (Take $\pi=\frac{22}{7}$

 

 

Total surface area of the block $=$ $cm^2$