Question

In a cyclinder, if radius is doubled and height is halved then its CSA will be

Answer 1

$<font color=red><marquee behavior=alternate>Solution</marquee></font>$

$(c.s.a.)2 = 2\pi \: (2r) \times ( \frac{h}{2} ) \\ = > (c.s.a.)2 = 2\pi rh =( c.s.a.)1$

then the C.S.A.will be the same as previous....