Question

Plz plz plz........ It's very urgent
In each example given below, radius of base of a cylinder and its height are given. Then find the curved surface area and total surface area.
1. r = 70 cm, h = 1.4 cm
2.r = 4.2 cm, h = 14 cm​

Answer 1

Answer:

1. CSA =

$2\pi rh$

2× 22/7 × 70 × 1.4

616 cm

tsa = 2πr(r+h)

= 2×22/7×70 ( 70+1.4)

= 440 × 71.4

= 31416

2. csa = 2πrh

= 2 × 22/7 × 4.2 × 14

= 369.6 cm

tsa = 2πr ( r+ h)

= 2 × 22/7 × 4.2 ( 4.2 + 14)

= 26.4 × 18.2

= 480.48 cm

Answer 2

Answer:

1)  r = 70 cm

    h = 1.4 cm

    C.S.A of cylinder = 2πrh

                                 = 2*22*70*1.4/7

                                 = 2*22*14

                                 = 616 cm²

     T.S.A of cylinder =  C.S.A. of cylinder + 2πr²

                                  =  616 + 2*22*70*70/7

                                  =  616+ 30800

                                  =   31416 cm²

2)  r = 4.2 cm

    h = 14 cm

     C.S.A of cylinder = 2πrh

                                  = 2*22*4.2*14/7

                                  =   2*22*14*0.6

                                  =   369.6 cm²

 T.S.A of cylinder =  C.S.A. of cylinder + 2πr²

                             =    369.6 + 2*22*4.2*4.2

                              =   369.6 + 776.16

                               =   1145.76 cm²

Step-by-step explanation

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