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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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3.) mr. smith’s class sold wrapping paper for $3.50 each and mr. davis’ class sold magazines for $2.75 each. together, the class
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Answer:

The number of wrapping paper sold was 32 and the number of magazines sold was 40

Step-by-step explanation:

Let

x ----> the number of wrapping paper sold

y ----> the number of magazines sold

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so

x+y=72 ----> equation A

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3.50x+2.75y=222 ----> equation B

Solve the system of equations by graphing

Remember that the solution of the system of equations is the intersection point both graphs

using a graphing tool

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see the attached figure

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3 years ago
During a spring clearance sale, Sears advertise 1/4 off the list of Model II microwave ovens and an additional 1/5 off the sale
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Answer:

$ 75.

Step-by-step explanation:

From the information above,

List price of model II = $240

Sale price of the clearance sale is 1/4 off the list price of Model II microwave oven and additional 1/5 of the sale price for oven that are scratched and dented.

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