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3 years ago

Find the volume of a cylinder with radius 8cm and height 10 cm, correct to 2 decimal places.

Mathematics

1 answer:

serious [3.7K]3 years ago

6 0

Answer:

$2010.62cm^3$

Step-by-step explanation:

The formula for the area of a circle is : $\pi *radius^2$

To work this out you would first have to work out the area of the circle. You can do this by multiplying pi by 8 squared, this gives you 201.06. This is because in order to calculate the volume you must calculate the area of one face of the shape.

The next step is to multiply 201.06 by 10, this gives you 2010.62.

1) Multiply pi by 8 squared.

$\pi*8^2=201.06$

2) Multiply 201.06 by 10.

$201.06*10=2010.62cm^3$

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What is 30 in the ratio 3:2

TiliK225 [7]

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Did you understand???

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2 years ago

How many times do 12 go into 30

Talja [164]

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2 years ago

For f(x) = 2x – 3 find f(-1/4)

Firdavs [7]

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Answer:

-3 1/2

Step-by-step explanation:

Put the argument where the variable is and do the arithmetic.

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5 0

2 years ago

Limited time . 10 points

AfilCa [17]

Answer:

Therefore the value of x is

$x=1\pm\sqrt{19}i$

Step-by-step explanation:

Given:

$x^{2}+20=2x$ which is

$x^{2}-2x+20=0$

To Find:

x = ? using Quadratic Formula

Solution:

For a Quadratic Equation ax² + bx + c = 0 , Formula Method is given as

$x=\dfrac{-b\pm\sqrt{b^{2}-4ac}}{2a}$

On Comparing with above we get

$a=1\\b=-2\\c=20$

Substituting a , b , c in Formula method we get

$x=\dfrac{-(-2)\pm\sqrt{(-2)^{2}-4(1)(20)}}{2\times 1}\\\\x=\dfrac{2\pm\sqrt{-76}}{2}\\\\x=\dfrac{2\pm2\sqrt{19}i}{2}\\Dividing\ by\ 2\ we\ get\\\\x=1 \pm\sqrt{19}i$