Eight coins fit exactly on a rectangular sheet of paper when lined up in 4 columns and two rows. Each coin is in the shape of a regular dodecagon, a polygon containing 12 sides. What fraction of the paper sheet will not be covered?

Respuesta :

Answer:

[tex]A_{f}[/tex]≅0.034[tex]L^{2}[/tex]

Step-by-step explanation:

The graph shows a rectangle and 8 dodecahedrons but a dodecahedron inscribed in a square is seen, so it is enough to calculate the fractions of areas between the square and the dodecahedron

Square area [tex]A_{s}=0.134L^{2}[/tex]

Area of ​​a right triangle  [tex]A_{rt}=\frac{(0.232L*0.134L)}{2}[/tex]

Area fraction [tex]A_{f}=4A_{c}+8A_{rt}\\A_{f}=4*(0.134L)^{2}+8*\frac{0.232L*0.134L}{2} =0.017956L^{2}+0.015544L^{2}[/tex]

[tex]A_{f}[/tex]≅0.034[tex]L^{2}[/tex]

Note: The fractions of the sides of the square and the right triangle are determined by assigning values ​​to L

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