the area A of the cross section of the column is
.
<u>Step-by-step explanation:</u>
Here we have , building engineer analyzes a concrete column with a circular cross section. The circumference of the column is 18π, pi meters. We need to find What is the area A of the cross section of the column .Let's find out:
We know that , Circumference of circle = ![2\pi r](https://tex.z-dn.net/?f=2%5Cpi%20r)
⇒ ![Circumference = 2\pi r](https://tex.z-dn.net/?f=Circumference%20%3D%202%5Cpi%20r)
⇒ ![18\pi= 2\pi r](https://tex.z-dn.net/?f=18%5Cpi%3D%202%5Cpi%20r)
⇒ ![\frac{18\pi}{2\pi }= \frac{2\pi r}{2\pi }](https://tex.z-dn.net/?f=%5Cfrac%7B18%5Cpi%7D%7B2%5Cpi%20%7D%3D%20%5Cfrac%7B2%5Cpi%20r%7D%7B2%5Cpi%20%7D)
⇒ ![\frac{18\pi}{2\pi }=r](https://tex.z-dn.net/?f=%5Cfrac%7B18%5Cpi%7D%7B2%5Cpi%20%7D%3Dr)
⇒ ![r=9](https://tex.z-dn.net/?f=r%3D9)
We know that area of circle = ![\pi r^2](https://tex.z-dn.net/?f=%5Cpi%20r%5E2)
⇒ ![Area= \pi r^2](https://tex.z-dn.net/?f=Area%3D%20%5Cpi%20r%5E2)
⇒ ![Area= \pi 9^2](https://tex.z-dn.net/?f=Area%3D%20%5Cpi%209%5E2)
⇒ ![Area= 81\pi](https://tex.z-dn.net/?f=Area%3D%2081%5Cpi)
Therefore , the area A of the cross section of the column is
.
C is the total amount and A is the #of articles of clothing
Answer:
<u>252 square inches is the surface area of Josiah's cereal box.</u>
Step-by-step explanation:
1. Let's review the information given to us to answer the question correctly:
Height of the box = 11 inches
Length of the box = 8 inches
Width of the box = 2 inches
2. What is the surface area of Josiah's cereal box?
Let's recall the surface area of a rectangular prism:
Surface area = 2 (width * length + height * width + length * height)
Surface area = 2 (2 * 8 + 11 * 2 + 8 * 11)
Surface area = 2 (16 + 22 + 88)
Surface area = 2 * 126
<u>Surface area = 252 inches²</u>