Help ASAP (find the area)
1 answer:
Area of pyramid is
Here in the diagram is pyramid which is made by triangle and rectangle.
What is the pyramid?
A pyramid is a polyhedron for which the base is a polygon and all lateral faces are triangles.
From figure we have:
AB = 8 cm, AC = 6 cm, BC = 10 cm
And height h = 5 cm
Now area of triangle = 1/2×AB×AC
= 1/2×8×6
=24 cm^2
And perimeter of triangle = 8 + 6 + 10
= 24 cm
Now area of pyramid = 24×5 + 2×24
= 168 cm^2
Hence Area of given figure is .
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The function in variable w giving the cost C (in dollars) of constructing the box is C(w) = 30w² + 270/w. The result is obtained by using the formula of volume and area of the box.
<h3>How to determine the function?</h3>We have a rectangular storage container without a lid.
- Volume, V = 10 m³
- Length, l = 2w
- Width, w = w
- Base costs $15/m²
- Sides costs $9/m²
The formula of volume of the box is
V = l × w × h
Where
- l = length
- w = width
- h = height
So, the height is
10 = 2w × w × h
10 = 2w² × h
h = 10/2w²
h = 5/w²
To find the total cost, calculate the area of base and sides of the box!
See the picture in the attachment!
The base area is
A₁ = 2w × w = 2w² m²
The sides area is
A₂ = 2(2wh + wh)
A₂ = 2(3wh)
A₂ = 6wh
A₂ = 6w(5/w²)
A₂ = 30/w m²
The total cost is
C = $15(2w²) + $9(30/w)
C = $30w² + $270/w
The function of the total cost is
C(w) = 30w² + 270/w
Hence, the function of constructing the box is C(w) = 30w² + 270/w.
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