It is necessary when you are getting into multiplying from the outside of parenthesis and multiplying variables inside of parenthesis.
ex: 5(3 + 3x)
5 * 3 = 15
5 * 3x = 15x
so final set up would be 15 + 15x
The crane is 139.8cm tall.
<h3>what is angle of elevation?</h3>
The angle formed by the line of sight and the horizontal plane for an object above the horizontal.
Using Trigonometry
tan 30 = h/y
1/√3 = h/y
y= h√3
and, tan 25= h/y+62
0.96= h/(h√3 +62)
h= 0..96 (h√3 +62)
h= 0.96*h*1.732+0.96*62
h=0.796h +28.52
0.2404h= 28.52
h= 139.8 cm
Hence, whooping crane is 139.8 cm.
Learn more about angle of elevation here:
brainly.com/question/21137209
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Answer:
circumference (c) = 43.96cm
Area (A) = 615.44cm²
Step-by-step explanation:
Here,
Radious (r) = 7 cm
circumference (c) = ![2\pi r](https://tex.z-dn.net/?f=2%5Cpi%20r)
= 2×3.14×7
=43.96cm
Area (A) = ![4\pi r^{2}](https://tex.z-dn.net/?f=4%5Cpi%20r%5E%7B2%7D)
= 4×3.14×7²
=12.56×49
= 615.44cm²
Answer:
Lateral Surface Area = 15.072 ![mm^2](https://tex.z-dn.net/?f=mm%5E2)
Step-by-step explanation:
Given that:
Base of Cylinder has radius, r = 1.2 mm
Height, h = 2 mm
To find:
Lateral Surface area of cylinder = ?
Solution:
We know that total surface area of a cylinder is given by:
![TSA = 2\pi r^2+2\pi rh](https://tex.z-dn.net/?f=TSA%20%20%3D%202%5Cpi%20r%5E2%2B2%5Cpi%20rh)
Here
is the area of two circular bases of the cylinder and
is the lateral surface area.
Please refer to the attached image for a better understanding of the Lateral and Total Surface Area.
So, LSA =
![\Rightarrow LSA = 2 \times 3.14 \times 1.2 \times 2\\\Rightarrow LSA = 6.28 \times 2.4\\\Rightarrow LSA = 15.072\ mm^2](https://tex.z-dn.net/?f=%5CRightarrow%20LSA%20%3D%202%20%5Ctimes%203.14%20%5Ctimes%201.2%20%5Ctimes%202%5C%5C%5CRightarrow%20LSA%20%3D%206.28%20%5Ctimes%202.4%5C%5C%5CRightarrow%20LSA%20%3D%2015.072%5C%20mm%5E2)
So, the answer is:
Lateral Surface Area of given cylinder = 15.072 ![mm^2](https://tex.z-dn.net/?f=mm%5E2)