Question

If the volume of cylinder is 9 900 square and with height of 20 cm and then what is its diameter?​

Answer 1

Step-by-step explanation:

volume of cylinder = area of circle× height

now, 9900= πr^2 × 20

hence, 9900/20= πr^2

495=22/7r^2

r^2=495×7/22

r^2= 157.5

r = 12.55

diameter= 2r

12.55×2 = 25.1

Answer 2

Answer:

Answer is d=25.1cm

Step-by-step explanation:

$volume \: of \: cylinder = \pi {r}^{2} h \\ 9900 = \frac{22}{7} \times {r}^{2} \times 20 \\ 9900 = \frac{440}{7} \times {r}^{2} \\ 9900 \times 7 = 440 \times {r}^{2} \\ 69300 = 440 \times {r}^{2} \\ \frac{69300}{440} = {r}^{2} \\ 157.5 = {r}^{2} \\ r = \sqrt{157.5} \\ r = 12.55cm \\ \\ d = 2r \\ d = 2 \times 12.55 \\ d = 25.1cm$

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