MCQ
If the surface area of a solid sphere is 1386cm2 then the total surface area of the solid hemisphere of the same radius is:
- A519.75cm2
- B1039.5cm2
- C1559.25cm2
- D693cm2
✓
Answer
- 1039.5cm2
Solution:
Surface area of a solid sphere is 1386cm2 $=4\pi\text{r}^2$
So, Total Surface area of hemisphere $=3\pi\text{r}^2$
Thus, $3\pi\text{r}^2=\frac{1386\times3}{4}$
$=1039.5\text{cm}^2$
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