Answer:
28.27
Step-by-step explanation:
Area of a circle A≈ πr2
3.14 x 3^2 ≈ 28.27
Answer:
It'd descend 25ft per second
Step-by-step explanation:
500 divided by 20
Answer:
I havent done this in a long time but I think it is 0x+4=y
Step-by-step explanation:
Answer:
Part 1) The lateral area is ![LA=791.7\ ft^{2}](https://tex.z-dn.net/?f=LA%3D791.7%5C%20ft%5E%7B2%7D)
Part 2) The surface area is ![SA=1,244.1\ ft^{2}](https://tex.z-dn.net/?f=SA%3D1%2C244.1%5C%20ft%5E%7B2%7D)
, ![SA=1,244.1\ ft^{2}](https://tex.z-dn.net/?f=SA%3D1%2C244.1%5C%20ft%5E%7B2%7D)
Step-by-step explanation:
step 1
Find the lateral area of the cone
we know that
The lateral area of the cone is equal to
![LA=\pi rl](https://tex.z-dn.net/?f=LA%3D%5Cpi%20rl)
we have
![r=12\ ft](https://tex.z-dn.net/?f=r%3D12%5C%20ft)
![l=21\ ft](https://tex.z-dn.net/?f=l%3D21%5C%20ft)
substitute
![LA=(3.1416)(12)(21)=791.7\ ft^{2}](https://tex.z-dn.net/?f=LA%3D%283.1416%29%2812%29%2821%29%3D791.7%5C%20ft%5E%7B2%7D)
step 2
Find the surface area of the cone
we know that
The surface area of the cone is equal to
![SA=\pi r^{2}+LA](https://tex.z-dn.net/?f=SA%3D%5Cpi%20r%5E%7B2%7D%2BLA)
we have
![r=12\ ft](https://tex.z-dn.net/?f=r%3D12%5C%20ft)
![LA=791.7\ ft^{2}](https://tex.z-dn.net/?f=LA%3D791.7%5C%20ft%5E%7B2%7D)
substitute
![SA=(3.1416)(12)^{2}+791.7=1,244.1\ ft^{2}](https://tex.z-dn.net/?f=SA%3D%283.1416%29%2812%29%5E%7B2%7D%2B791.7%3D1%2C244.1%5C%20ft%5E%7B2%7D)