Answer:
the area for the square is 126.56cm²:
Answer:

Step-by-step explanation:
Since, we know that,
The surface area of a cylinder having both ends in both sides,

Where,
r = radius,
h = height,
Given,
Diameter of the sphere = 4 cm,
So, by using Pythagoras theorem,
( see in the below diagram ),



Thus, the surface area of the cylinder,

Differentiating with respect to r,



Again differentiating with respect to r,

For maximum or minimum,






Since, for r = √2,

Hence, the surface area is maximum if r = √2,
And, maximum surface area,




Answer:
4x+4
Step-by-step explanation:
Combine like terms:
3x+x= 4x
Add remaining terms (+4)
4x+4
On the cube, it measures in numerical order 1 to 6, so:
1,2,3,4,5,6.
We are finding how much red fabric was used for even numbered sides.
So we are looking for sides 2,4,6
Since 20 in. is measured on a side, we can determine the area: 20*2= 40 in.^2 (all sides are same and length*width)
Now we have how much fabric is used on each side, so apply the area to all the even numbers (2,4,6)
40*3= 120 inches