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1.Use the figure to answer the questions.

 

 

 

(a) Explain why the triangles are similar.

(b) Find the value of y. Show your work

 

 

 

2. Danae is making a candle by pouring melted wax into a mold in the shape of a cone. The radius of the base of the cone is 2 in and the height of the cone is 8 in. To get the wax for the candle, Danae melts blocks of wax that are each 1 in by 1 in by 2 in. How many of the wax cubes will Danae need in order to make the candle? Show your work.

StrongJet  Jun 16, 2017
 #1
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1.

(a)

Since   ∠C = ∠S  , these triangles are similar IF

 

\(\frac{30}{45}=\frac{16}{24} \\~\\ \frac{30\,\div\,15}{45\,\div\,15}=\frac{16\,\div\,8}{24\,\div\,8} \\~\\ \frac23=\frac23\qquad\text{true}\)

 

So, these triangles are similar.

 

(b)

Since these triangles are similar...

\(\frac{y}{14}=\frac{30}{16} \\~\\ y=\frac{30}{16}\,*\,14 \\~\\ y=26.25\)

 

 

 

2.

volume of cone  =  (1/3) * (pi * radius2) * (height)

                          =  (1/3) * (pi * 22) * (8)

                          =  (1/3) * pi * 4 * 8

                          =  32pi / 3                 cubic inches

 

volume of block  =  length * width * height

                           =  1 * 1 * 2

                           =  2                          cubic inches

 

How many blocks fit into the cone?

How many   2 cubic inches   fit into    32pi / 3 cubic inches ?

 

\(\frac{32\pi}{3}\,\div\,2 \,=\,\frac{32\pi}{3}\,*\,\frac12\,=\,\frac{32\pi}{6}\,\approx\,16.755\)

hectictar  Jun 16, 2017

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