Question

Hii friends

Plzzzz do these sums

Answer 1

4.radius of an open cylinder means its total surface area=(2*3.14*r*h)+(3.14*r*r)=2*3.14*7*50+(3.14*49)=2351.6cm

5.

Answer 2

H=91cm
R =30cm

as we have to calculate CSA
SO CSA =2PIERH
$2\pi rh \\ 2 \times \frac{22}{7} \times 30 \times 91 \\ 17160cm {}^{2}$
$as \: 1m = 100cm \\ so \: 1 {m}^{2} = 10000cm {}^{2}$
$\frac{17160}{1000} \\ 1.716 {m}^{2}$
$1.716 \times 100 \\ 171.6m {}^{2}$