A cylinder has a surface area of 339cm. The radius is two times greater than the height. what is the radius of the cylinder.

1 answer:

8 0

The answer is 6 cm.

The surface area of the cylinder is:
SA = 2πr² + 2πrh

SA = 339
r = 2h
⇒ h = r/2
r = ?
π = 3.14

339 = 2πr² + 2πr*r/2
339 = 2πr² + πr*r
339 = 3πr²
πr² = 339/3
πr² = 113
r² = 113/π
r² = 113/3.14
r² ≈ 36
r = √36
r = 6

You might be interested in

Which values of x and y satisfy 2x − y = 7 and 3x − 2y = 5 simultaneously?

photoshop1234 [79]

To solve problems like this you can either graph or solve mathematically. To do the ladder we need to solve for one variable at a time. So lets cancel one variable out.
Multiply equation 1 by 2
This will give 4x-2y=14
Now we can get rid of y by subtracting 2 from 1
This will give x=9
Plug back in to either equation, i will use equation 2
3(9)-2y=5 simplify
-2y=-22 solve
Y=11

8 0

3 years ago

What is the area of the frame around the picture?

larisa [96]

12 x 6s - 8 x 4s = 72s - 32s = 40s

3 0

4 years ago

Read 2 more answers

Will mark as brainliest if correct

Alenkinab [10]

Answer:

x = 2

Step-by-step explanation:

9^2 or 9(9) = 81

8 0

3 years ago

A van has room for 6students and 2teachers . How many vans are needed for a total of 48students and 16 teachers?

Juliette [100K]

8 vans are need for all to go

7 0

3 years ago

(-2,4) on cordinate plane

lakkis [162]

The coordinate -2, 4 implies -2 is the value on the x or horizontal axis and 4 is the value on the y or vertical axis.

<h3>What is a coordinate plane?</h3>

This a plane used for graphs or points that is based on a vertical axis (y) and a horizontal axis (x).

<h3>How does -2,4 look on a coordinate plate?</h3>

The first number, -2 indicates the value in x or the horizontal axis, while the second number 4 indicates the position on y or the vertical axis. You can see this in the imaged attached (red dot).

Learn more about plane in: brainly.com/question/24198263

#SPJ1

8 0

2 years ago