Answer:
315
Step-by-step explanation:
We are told in the question that each fret marker is in the shape of a parallelogram
The area of a parallelogram is given as
Base × Height.
Each of the bottoms of the fret markers has the following values
Base = 52.5mm
Height =6 mm
The area of each of the bottom fret markers
= Base × Height
= 52.5 × 6
= 315
Therefore, the area of each of the bottom fret markers without unit is 315
Check the picture below.
well, the volume of the craft prism will simply be length * width * height, and we know that is 7140.
![\textit{volume of a rectangular prism}\\\\ V=Lwh ~~ \begin{cases} L=length\\ w=width\\ h=height\\[-0.5em] \hrulefill\\ L=17\\ h=28\\ V=7140 \end{cases}\implies \begin{array}{llll} 7140=(17)w(28)\implies \cfrac{7140}{(17)(28)}=w \\\\\\ 15=w \end{array}](https://tex.z-dn.net/?f=%5Ctextit%7Bvolume%20of%20a%20rectangular%20prism%7D%5C%5C%5C%5C%20V%3DLwh%20~~%20%5Cbegin%7Bcases%7D%20L%3Dlength%5C%5C%20w%3Dwidth%5C%5C%20h%3Dheight%5C%5C%5B-0.5em%5D%20%5Chrulefill%5C%5C%20L%3D17%5C%5C%20h%3D28%5C%5C%20V%3D7140%20%5Cend%7Bcases%7D%5Cimplies%20%5Cbegin%7Barray%7D%7Bllll%7D%207140%3D%2817%29w%2828%29%5Cimplies%20%5Ccfrac%7B7140%7D%7B%2817%29%2828%29%7D%3Dw%20%5C%5C%5C%5C%5C%5C%2015%3Dw%20%5Cend%7Barray%7D)
we know the area of the top is just w * 17, and the circle is just 2/5 of that, well that's just

Let the segment be represented by AB where A(0,0) =
and B(3/4,9/10) =
.
The length of the segment drawn by architect can be calculated using distance formula:
AB =



Similarly, Let the actual end points of segment be AC where A(0,0) =
and C(30,36) =
.
The length of the original segment can be calculated using distance formula:
AC =


.
Thus, the actual length is 40 times the length of the segment drawn by the architect.
Thus, the proportion of the model is 1:40