Solution
diameter of hemisphere = 7 cm
radius of hemisphere = $$\frac{7}{2}$$ cm
Total surface area of a closed hemisphere =Â $$3\times\ \pi\ \times\ \left(radius\right)^2$$
= $$3\times\ \frac{22}{7}\times\ \left(\frac{7}{2}\right)^2$$
=Â $$3\times\ \frac{22}{7}\times\frac{49}{4}$$
= $$3\times\ 11\times\frac{7}{2}$$
=Â $$33\times3.5$$
=Â 115.5Â $$cm^{2}$$
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