(WILL GIVE BRAINLIEST) Question is What is the radius of these cylinder?

:)

Ques 1)

CAN D

Ques 2)

252 pi in.^2

Ques 3)

288 pi cm^3

Ques 4)

2080 pi ft. ^2

Ques 5)

540 pi in. ^3

Step-by-step explanation:

Let r denote the radius of the cylinder.

and h denote the height of the cylinder.

Ques 1)

We know that the least amount of paper is required by the can whose lateral surface area is the smallest.

We know that the lateral surface area of cylinder is given by:

CAN               Radius             Height              Lateral Area

A                   2 in.                 6 in.              75.36 square in.

B                   2.5 in.              5 in.              78.5 square in.

C                   3 in.                  4 in.               75.36 square in.  

D                   3.2 in.               3 in.               60.288 square in.

Hence, the can that requires the least amount of paper is:

CAN D.

Ques 2)

r=6 in.

h=15 in.

The surface area of cylinder is calculated as:

Hence, on putting the given values in the formula we have:

Hence,

SA=252 pi in.^2.

Ques 3)

diameter(d)=8 cm.

This means that:

r=d/2=4 cm.

h=18 cm.

Hence, the volume(V) of the cylinder is calculated as:

Hence,

Volume is: 288 pi cm^3

Ques 4)

d=40 feet.

h=32 feet.

Hence, r=d/2=40/2=20 feet.

Hence, the surface area of the cylinder is calculated as:

Hence, SA=2080 pi ft. ^2

Ques 5)

r=6 in.

h=15 in.

Hence, the volume of the cylinder is given by:

Hence,

Volume= 540 pi in. ^3

Step-by-step explanation:

Have a great week! Your welcome!