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This question is very easy all you do is take 3 x (-4) =-12 -12 x 2=-24

(a is the length of the side of each edge of the cube)

In words, the surface area of a cube is the area of the six squares that cover it. The area of one of them is a*a, or a 2 . Since these are all the same, you can multiply one of them by six, so the surface area of a cube is 6 times one of the sides squared.

Example #1:

Find the surface area if the length of one side is 3 cm

Surface area = 6 × a² 

Surface area = 6 × 3² 

Surface area = 6 × 3 × 3 

Surface area = 54 cm² 

To be honest, Melody, your answer is half right, and here's why:

The distortion of the large square and 7 small squares happened at the top, not at the bottom.

In the Figure 2, parts 2 and 3 have pushed part 1 upward, and the large square became the rectangle;

7 small squares in the top 2 rows became distorted by taking in that missing small square.

As a result, they also became the rectangels.

Please, take a look at my not-so-fancy post, Figure 2, and I'm sure you'll understand my points.

So we have.....

(1)   sin 49 = 3 / P   where P is the plank length  = AC

Rearrange

P = 3 / sin 49 = about 3.975 ft  = about 4 ft. rounded to the nearest tenth

(2) tan 49 = 3 / BC     rearrange

BC = 3 / tan 49  = about 2.608 ft = 3 ft rounded to the nearst foot 

10.00000000E+29 but this answer is only for the first 15 number 9's, my tablets calculator will not go any higher.

We have .....

sin Θ  = 16 / 20

So .. using the sine inverse, we have...

sin^-1 (16/20)  = Θ  = about 53.13°

C=49 degrees and line BA= 3ft. Line BA is on the ground, BC is the wall, and CA is the plank. I have had this question before but I do not remember the answer I am sorry mister or miss.

There is not enough info here to solve this....we would also have to know one of the other angles other than the right angle.....

It was a triangle question and thank you for that link, it helped me answer that question.

You are very welcome.

a^(-1)/b^2 *(a^(-1)/(2b^2 ))^(-2) =

1 / [ ab^2] * [2b^2 / a^(-1)] ^2  =

1 /  [ ab^2] * [ 2ab*2]^2  =

1/ [ ab^2] * [ 4 a^2 b^4 ] =

4ab^2

U dont need a pie buttom...

Pie = 3.14

Thank you kind sir :)

There is a pie button, it just depends on what type of calculator you are using

Thanks..!!!!!!!!!!!

Surface Area of a Cylinder = 2 pi r 2 + 2 pi r h

(h is the height of the cylinder, r is the radius of the top)

Surface Area = Areas of top and bottom +Area of the side

Surface Area = 2(Area of top) + (perimeter of top)* height

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

In words, the easiest way is to think of a can. The surface area is the areas of all the parts needed to cover the can. That's the top, the bottom, and the paper label that wraps around the middle.

You can find the area of the top (or the bottom). That's the formula for area of a circle (pi r2). Since there is both a top and a bottom, that gets multiplied by two.

The side is like the label of the can. If you peel it off and lay it flat it will be a rectangle. The area of a rectangle is the product of the two sides. One side is the height of the can, the other side is the perimeter of the circle, since the label wraps once around the can. So the area of the rectangle is (2 pi r)* h.

Add those two parts together and you have the formula for the surface area of a cylinder.
Surface Area = 2(pi r 2) + (2 pi r)* h

(http://www.math.com/tables/geometry/surfareas.htm)

MEANT CYLINDER

Thank you guys for the answers to my question.

the measure is at least 85 degrees.

Length*width*6=SA=ans

Surface Area of a Cube = 6 a 2

 (a is the length of the side of each edge of the cube)
In words, the surface area of a cube is the area of the six squares that cover it. The area of one of them is a*a, or a 2 . Since these are all the same, you can multiply one of them by six, so the surface area of a cube is 6 times one of the sides squared.

Try this link if your calculating triangles

Yes....!..!

Correct, MG1......!!!!!