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Allushta [10]
3 years ago
14

Does anyone know how to do #4 plz help me!!!

Mathematics
2 answers:
koban [17]3 years ago
6 0

Answer:

The area of the circular ends of the cylinder.

Step-by-step explanation:

The total surface area of a right circular cylinder is

... total area = area of circular ends + lateral surface area

The <em>lateral surface area</em> can be considered to be a rectangle whose length is the circumference of the cylinder and whose width is the height of the cylinder. For a cylinder of radius r and height h, this is described by the product ...

... lateral surface area = 2πrh

The area of the (congruent) circular ends is twice the area of one of the ends. That area is the area of a circle of radius r, so is described by ...

... area of one circular end = πr²

Then ...

... area of circular ends = 2πr²

and the total area of the cylinder is ...

... total area = 2πr² + 2πrh . . . . matches the formula in your problem statement

liberstina [14]3 years ago
4 0
If you can get me some numbers this would be easier
however there's r= radius
h=height
I'm not fully understanding this
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