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Marta_Voda [28]
3 years ago
8

How to calucate surface area​

Mathematics
2 answers:
umka2103 [35]3 years ago
7 0

Answer:

2πrh + 2πr²

Step-by-step explanation:

The surface area of a cylinder is made up of the lateral area (area of the curved side of the cylinder) and of the ends.

The lateral area is A = πdh, where d is the diameter of the cylinder and h is the height.  This is equivalent to A = 2πrh, where r is the radius.

The area of one end of the cylinder is A = πr².

We must multiply that by 2 if we want the total area of the ends.

Then the overall total is

A = πdh + 2πr², or 2πrh + 2πr².

bearhunter [10]3 years ago
5 0

Answer:

Surface area of a cylinder = 2πrh+2πr²

r = radius

h = height

Step-by-step explanation:

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Trey runs each lap in 6 minutes. He will run at least 30 minutes today. What are the possible numbers of laps he will run today?
vlada-n [284]

Answer:

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2 years ago
How many solutions does this equation have? How do you know?<br><br> 8x +14 - 4x = 9 + 4x - 5
MAVERICK [17]

Answer:

no solutions.

Step-by-step explanation:

8x + 14 -4x = 9+4x -5

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0x = -10

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5 0
2 years ago
*PLEASE HELP ME* (math attachment) IT'S PAST MIDNIGHT I'M TIRED AND DESPERATE
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<h3><u>Answer:</u></h3>

D

<h3><u>Step-by-step explanation:</u></h3>

let's rewrite this

x + y = 11                  <em>- equation 1</em>

   - x = - y - 9           <em>- equation 2</em>

solve the first equation for x

x + y = 11            (add -y to both sides to get x by itself)

     x = -y + 11          <em> - equation 3</em>

now substitute -y + 11 for x in the second equation

 y - 11 = - y - 9        (2 negative signs next to each other equals positive)

2y - 11 = -9              (add y to both sides)

      2y = 2               (add 11 to both sides)

        y = 1                (divide both sides by 2)

now substitute y = 1 into equation 3

x = -1 + 11

x = 10

therefore, x = 10 and y = 1. in coordinates, x goes before y

therefore, the coordinates are (10, 1)

therefore the answer is D

good luck my friend! hope this helped a lot! also, i found a website if you don't fully understand this, its called MathPapa, i didn't use it to work this out so my working might be different but it definitely helps me sometimes. for an equation like this, type it likes this: x+y=11; -x=-y-9

-cheesetoasty

3 0
3 years ago
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Licemer1 [7]

Answer:

A=2(wl+hl+hw)=2·(8·12+4·12+4·8)=352

Step-by-step explanation:

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4 0
3 years ago
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3x-8y=24 <br> y=x-8<br> Please show <br> work
In-s [12.5K]

Answer:

3x - 8y = 24   --------(1)

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substitute  y in (1)

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substitute x in (2)

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4 0
2 years ago
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