PLEASE HELP MEEEE!!!! I need so much help on this!!!!?

Question

I was absent from school today {strep throat}, all of my freinds are at a lodge party so i cant call them and I missed todays review.
Can anyone explain to me surface area of a rectangle, volume of a cylinder...... Ill give ten points to whoever tried their best to help me.

Oh and also surface area of a cylinder...please................

Answer 1

For surface areas: http://www.math.com/tables/geometry/surfareas.htm For volume: http://www.aaamath.com/geo79-volume-cylinder.html

Answer 2

Surface area means the outside area of the item you are talking about. Imagine yourself drawing "squares" onto the surface of a box. That is essentially what you are doing - counting up those squares.

Usually, when you talk about surface area, it refers to three dimensional objects. You find the area of all the sides, and add them together.

Area of a rectangle is length times width (l x w). If you have just a simple rectangle, that is all you do. If you are talking about the surface area of a cube (box) you find the surface area of the sides, then add them together.

Volume is length times width, times depth (how deep an object is). It measures how many units of a cube you can fit inside the object. For example, lets say you are using inches for the unit. You are figuring out inches (unit) cubed. Basically it means that there are x amount of 1 inch x 1 inch x 1 inch cubes.

Surface area of a cylinder is taking apart the cylinder and figuring out the area of each piece. Imagine an orange juice can. You would figure out the area of the top (base) of the can, then measure the circumference (the perimeter of the circle) times the length of the tube.

Add the top, the bottom, and the tube areas together. Poof...your answer.

Volume of a cylinder is

Volume = (pi)(r^2)h where pi = 3.14..., r = radius or half the distance across the base (circle) squared, and h = the height of the tube. You multiply all those pieces together and you have how many cubes, like I said before, inside the cylinder.

Answer 3

Surface Area of a rectangle:

2(lxb)+2(lxh)

two times the length times the breadth plus two times the length times height. Make sure you use the brackets, or you will get the wrong answer!.

Surface area of a cylinder:

A cylinder can be open (like a pipe, you can see though to each end)

Or a cylinder can be closed (like a can of drink)

So to work our the Surface area (SA) of a open cylinder you:

2 x ∏ x r x h

Which is 2 times pie, times the radius times the height.

To work out the area of a closed cylinder:
FORMULA: 2 x ∏ x r squared+ 2 x ∏ x h

TOP AND BOTTOM:

2x ∏ x r squared

Which is pie times the raduis squared.

2 x ∏ x r x h

Which is 2 times pie, times the radius times the height.

VOLUME OF A CYLINDER:

∏ x r squared x h

Pie times radius squared times the height.

Martha...

P.s Sorry the symbols are dodgy..

Answer 4

area of the rectangle
Label base, height
Measure and compute area using A = bh


So what you need to do is write out A = base (times) height




The surface area of a cylinder is a bit harder. But once you know what you are looking for it will come easily.

Area of a cylinder =2( times) Pi( times) radius squared. + 2( times) pi ( times) radius ( times ) height.

= 2(pi r 2) + (2 pi r)* h

Assuming you know that pi = 3.1416




The volume of a cylinder is V= pi*radius^2* height V = πr2h
V = πr2h
V = 3.14 x radius2 x height
V =

KEEP Measurements right like cm or meters.
The trick is to remember to square the radius


If you need more help let me know
Feather

Answer 5

SA rectangle : length x width
Volume of cylinder: pi • r² • height
SA cylinder: (2 • pi • r²) + (2 • pi • r • height)