Answer
a) 131.88 cm$^2$
b) no, no
Work Step by Step
a)
$\pi r(l+r)\longrightarrow$ substitute the given values
$=3.14(3)(11+3)\longrightarrow$ add in parentheses
$=3.14(3)(14)\longrightarrow$ multiply
$=131.88\ cm^2$
b) The surface area does not double in either case because l and r are used as addends, not just as factors.
$\pi r(l+r)\longrightarrow$ substitute the given values
$=3.14(3)(22+3)\longrightarrow$ add in parentheses
$=3.14(3)(25)\longrightarrow$ multiply
$=235.5 cm^2$
$\pi r(l+r)\longrightarrow$ substitute the given values
$=3.14(6)(11+6)\longrightarrow$ add in parentheses
$=3.14(6)(17)\longrightarrow$ multiply
$=320.28 cm^2$
