Answer:
Last option: ![A=2\pi rh](https://tex.z-dn.net/?f=A%3D2%5Cpi%20rh)
Step-by-step explanation:
If the shell of a bass drum was cut down one side and laid flat, the resulting shape would be a rectangle.
The area of a rectangle can be calculated with the formula:
![A=l*w](https://tex.z-dn.net/?f=A%3Dl%2Aw)
Where l is the lenght and w is the width.
In this case, the lenght of the rectangle obtained (the lenght of the shell) is the circumference of the drum.
Remember that the circumference of the circle can be calculated with:
![C=2\pi r](https://tex.z-dn.net/?f=C%3D2%5Cpi%20r)
Where r is the radius of the circle.
Then:
![l=2\pi r](https://tex.z-dn.net/?f=l%3D2%5Cpi%20r)
The width is the height of the shell:
![w=h](https://tex.z-dn.net/?f=w%3Dh)
Then, substituting into
, you get:
![A=2\pi rh](https://tex.z-dn.net/?f=A%3D2%5Cpi%20rh)
Answer: Switch a with c and you are good. I think that is what you are asking?
Step-by-step explanation:
Answer:
X is 160 degrees
Step-by-step explanation:
Angles on a straight line add up to 180 degrees.
Answer: a = -5
Step-by-step explanation:
-3 (9a+2)=129
-27a -6 = 129
-27a = 129+6
-27a = 135
a = -135/27
Answer:
k=5
Step-by-step explanation:
steps in attachment