A) \[1440\text{ }c{{m}^{2}}\]
B) \[385\text{ }c{{m}^{2}}\]
C) \[1580\text{ }c{{m}^{2}}\]
D) \[770\text{ }c{{m}^{2}}\]
Correct Answer: D
Solution :
(d): Radius of cylinder, hemisphere and cone = 5 cm Height of cylinder =13 cm; Height of cone =12 Surface area of toy \[=2\pi rh+\frac{4\pi {{r}^{2}}}{2}+\pi rL\]; \[L=\sqrt{{{h}^{2}}+{{r}^{2}}}=\sqrt{{{12}^{2}}+{{5}^{2}}}=13\] Then, surface area =\[(2\times 3.14\times 5\times 13)+(2\times 3.14\times 25)\]\[+(3.14\times 5\times 13)=770\,\,c{{m}^{2}}\]You need to login to perform this action.
You will be redirected in
3 sec