MCQ
if $x - y = 2 $ and $\frac{2}{\text{x+y}} = \frac{1}{5}$ then :
- A$x = 5, y = 3$
- ✓$x = 6, y = 4$
- C$x = 4, y = 2$
- D$x = 7, y = 5$
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Assertion (A)
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Reason (R)
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If the radii of the circular ends of a bucket 24cm high are 15cm and 5cm respectively, then the surface area of the bucket is $545\pi\text{cm}^2.$
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if the radii of the circular ends of the frustum of a cone are R and r respectively and its height is h, surface area is:
$\pi\big\{\text{R}^2+\text{r}^2+\text{l}(\text{R}-\text{r})\big\}$
where $\text{l}^2=\text{h}^2+(\text{R}+\text{r})^2.$
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