Question

the csa of a cylinder is 94.2 cm2 and its height is 5cm . find radius (used pi =3.14 )​

Answer 1

formula of CSA of cylinder is given below:-

$2\pi \: rh$

given that

$2\pi \: rh = 94.2 \: {cm}^{2}$

let the given statement be equation number 1.

height of cylinder (h) = 5 cm.

pi =3.14

now to find the radius just put the given values in equation no. 1

$2 \times 3.14 \times r \times 5 = 94.2$

$6.28 \times 5 \times r = 94.2$

$31.4 \times r = 94.2$

$r = \frac{94.2}{31.4}$

$r = 3$

Radius of the cylinder (r) = 3cm.

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Answer 2

given, CSA=94.2 cm^

Height,h=5 cm

Solution:-

CSA = 94.2

2πrh = 94.2

2*3.14*r*5 = 94.2

3.14*r*5 = 94.2/2

3.14*r*5 = 47.1

3.14*r = 47.1/5

3.14*r = 9.42

r = 9.41/3.14

r = 3 cm^