Question

r= 1.4cm, h= 2.1cm
Find the curved surface area and total surface area

Answer 1

Curved surface area = $18.48 cm^2$

Total surface area = $30.08 cm^2$

Step-by-step explanation:

Given:

r = 1.4 cm

h = 2.1 cm

Now,

Curved surface area = 2πrh

                                   = $2 \times \frac{22}{7} \times 1.4 \times 2.1$              $[\pi = \frac{22}{7} ]$

                                   = $2 \times 22 \times 0.2 \times 2.1$

                                   = $18.48 cm^2$

Total surface area = 2πr(h+r)

                               = $2 \times \frac{22}{7} \times 1.4 (2.1+1.4)$          $[\pi = \frac{22}{7} ]$

                               = $2\times 22\times 0.2 \times 3.5$

                               = $30.08 cm^2$

Answer 2

Answer :

solution:

FOR CYLINDER R = 1.4 CM , H = 2.1 .

Step-by-step explanation:

CURVED SURFACE AREA = 2$\pi$r h  

                                            = 2 X $\frac{22}{7}$ X 1.4 X 2.1

curved surface area          = 18.48 cm square

therefore, total surface area =  2$\pi$r(r +h)

                                                =  2 X $\frac{22}{7}$ X 1.4 ( 1.4 + 2.1 )

                                                =  2 x  $\frac{22}{7}$ x 1.4 x 3.5

                                                 = 30.8 cm square

answer : total surface area = 30.8

HOPE IT HELPS PLEASE MARK ME AS BRAIN LIST