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DIA [1.3K]
3 years ago
15

A company manufactures spherical containers for small toys, each with a radius of 2 cm. The company also sells a smaller product

that is exactly half the shape of the original container. The resulting shape is a hemisphere. What is the surface area of the hemisphere? What is the surface area of the rounded part of the hemisphere? π in.2 What is the area of the circular base of the hemisphere? π in.2 What is the total surface area of the hemisphere? π in.2 Another student completed the same problem, but used the formula 3πr2 to determine the surface area. How would this solution compare to the surface area determined above? The solution would be the surface area determined above.
Mathematics
1 answer:
givi [52]3 years ago
4 0

Answer:

(a)8\pi cm^2\\(b)4\pi cm^2\\(c)12\pi cm^2\\(d)12\pi cm^2

Step-by-step explanation:

Radius of the Sphere =2cm

(a)Surface Area of the rounded part of the Hemisphere

=2\pi r^2\\=2\pi *2^2\\=8\pi cm^2

(b)Area of the circular base of the hemisphere

=\pi r^2\\=\pi *2^2\\=4\pi cm^2

(c)Total Surface Area =Area of the rounded part+Area of the circular base

=8\pi + 4\pi=12\pi cm^2

(d)If another student completed the same problem using the formula,

Surface Area of a Hemisphere

=3\pi r^2\\=3\pi *2^2\\=12\pi cm^2

The solution would be the <u>same as the surface area</u> determined above.

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The sides of a triangle are 1, x, and x2. what are possible values of x?
Whitepunk [10]
The sides of the triangle are given as 1, x, and x².

The principle of triangle inequality requires that the sum of the lengths of any two sides should be equal to, or greater than the third side.

Consider 3 cases
Case (a):  x < 1,
      Then in decreasing size, the lengths are 1, x, and x².
      We require that x² + x ≥ 1
      Solve x² + x - 1 = 
      x = 0.5[-1 +/- √(1+4)] = 0.618 or -1.618.
      Reject the negative length.
     Therefore, the lengths are 0.382, 0.618 and 1.

Case (b): x = 1
   This creates an equilateral triangle with equal sides
    The sides are 1, 1 and 1.

Case (c): x>1
  In increasing order, the lengths are 1, x, and x².
  We require that x + 1 ≥ x²
  Solve x² - x - 1 = 0
  x = 0.5[1 +/- √(1+4)] = 1.6118 or -0.618
  Reject the negative answr.
 The lengths are 1, 1.618 and 2.618.

Answer:
The possible lengths of the sides are
(a) 0.382, 0.618 and 1
(b) 1, 1 and 1.
(c) 2.618, 1.618 and 1.

7 0
3 years ago
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katrin2010 [14]

Step-by-step explanation:

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hence the answer would be

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comment if you still have any doubts :)

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1 year ago
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Klio2033 [76]

Answer:

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Step-by-step explanation:

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OR

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Answer:

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Step-by-step explanation:

Firstly, we know that the slopes are the same because parallel lines have the same slope. Then we can find the y-intercept by using the slope and point in slope-intercept form.  

y = mx + b ---> plug in known values

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3 = 3 + b ---> Subtract 3 from both sides.  

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