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JulijaS [17]
3 years ago
11

How do you find surface area of a cylinder?

Mathematics
2 answers:
Wittaler [7]3 years ago
5 0
Idk I need help too pls comment
Vlad1618 [11]3 years ago
4 0
A= 2pi(radius)(height)+2pi(radius)^2 
Mark me as brainiest! <3
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98 POINTS MATH!
patriot [66]

Let a be the length of the leg with one tick mark and b the length of the leg with two tick marks.

In the upper triangle, the law of cosines says

6^2=a^2+b^2-2ab\cos43^\circ

In the lower triangle, it says

4^2=a^2+b^2-2ab\cos(4y-5)^\circ

Subtract the second equation from the first to eliminate a^2+b^2:

6^2-4^2=-2ab(\cos43^\circ-\cos(4y-5)^\circ)

10=ab(\cos(4y-5)^\circ-\cos43^\circ)

a and b are lengths so they must both be positive. 10 is also positive, so in order to preserve the sign on both sides of this equation, we must have

\cos(4y-5)^\circ-\cos43^\circ>0

\cos(4y-5)^\circ>\cos43^\circ

Now we have to be a bit careful. If x is an acute angle, then as x gets larger, the value of \cos x gets smaller. So if we have two angles \theta and \varphi, with 0^\circ, then we would have \cos\theta>\cos\varphi.

This means in our inequality, taking the inverse cosine of both sides would reverse the inequality:

(4y-5)^\circ

We know that (4y-5)^\circ is an angle in a triangle, so it must be some positive measure:

(4y-5)^\circ>0^\circ\implies y>\dfrac54^\circ

So we must have

\dfrac54^\circ

6 0
3 years ago
Which of these are unit ratesA square yard for every 100 grass seeds4 acres for 800 plants2 plants in a square foot6 plants in 1
tiny-mole [99]

2 plants in a square foot

6 plants in a square yard

8 seeds per square foot

8 0
2 years ago
7). Tim has 9 chocolate chip cookies and 18 peanut butter cookies. He
Naily [24]

Answer:

2 groups

Step-by-step explanation:

  1. 18 ÷ 9 = 2 groups

I hope this helps!

4 0
2 years ago
Anyone can help please and quickkkk
melomori [17]

The values of x, y, and z are 1, 2, and 3 respectively after using the substitution method.

<h3>What is a linear equation?</h3>

It is defined as the relation between two variables, if we plot the graph of the linear equation we will get a straight line.

If in the linear equation, one variable is present, then the equation is known as the linear equation in one variable.

We have a linear equation in three variable:

2x + 3y - z = 5 ...(1)

4x - y - z = -1 ...(2)

x + 4y + z = 12 ...(3)

\rm \mathrm{Substitute\:}x=\dfrac{5-3y+z}{2}   (from the equation 1 and 2)

After solving:

\rm \begin{bmatrix}-7y+z+10=-1\\ \dfrac{5y+3z+5}{2}=12\end{bmatrix}

From the above, two equations:
y =2

z =3

Plug the above values in equation 1

x = 1

Thus, the values of x, y, and z are 1, 2, and 3 respectively after using the substitution method.

Learn more about the linear equation here:

brainly.com/question/11897796

#SPJ1

5 0
2 years ago
How I can answer this question, NO LINKS, if you answer correctly I will give u brainliest!
allochka39001 [22]

Answer:

I think b) is the answer I solve it but

8 0
2 years ago
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