MathDB
Coloring a Cube

Source: 2019 AMC8 #12

December 26, 2019
AMCAMC 8geometry3D geometry

Problem Statement

The faces of a cube are painted in six different colors: red (R), white (W), green (G), brown (B), aqua (A), and purple (P). Three views of the cube are shown below. What is the color of the face opposite the aqua face?
<span class=’latex-bold’>(A) </span>red<span class=’latex-bold’>(B) </span> white<span class=’latex-bold’>(C) </span>green<span class=’latex-bold’>(D) </span>brown <span class=’latex-bold’>(E)</span> purple\text{<span class='latex-bold'>(A) </span>red}\qquad \text{<span class='latex-bold'>(B) </span> white}\qquad\text{<span class='latex-bold'>(C) </span>green}\qquad\text{<span class='latex-bold'>(D) </span>brown }\qquad\text{<span class='latex-bold'>(E)</span> purple}
[asy] unitsize(2 cm);
pair x, y, z, trans; int i;
x = dir(-5); y = (0.6,0.5); z = (0,1); trans = (2,0);
for (i = 0; i <= 2; ++i) { draw(shift(i*trans)*((0,0)--x--(x + y)--(x + y + z)--(y + z)--z--cycle)); draw(shift(i*trans)*((x + z)--x)); draw(shift(i*trans)*((x + z)--(x + y + z))); draw(shift(i*trans)*((x + z)--z)); }
label(rotate(-3)*"RR", (x + z)/2); label(rotate(-5)*slant(0.5)*"BB", ((x + z) + (y + z))/2); label(rotate(35)*slant(0.5)*"GG", ((x + z) + (x + y))/2);
label(rotate(-3)*"WW", (x + z)/2 + trans); label(rotate(50)*slant(-1)*"BB", ((x + z) + (y + z))/2 + trans); label(rotate(35)*slant(0.5)*"RR", ((x + z) + (x + y))/2 + trans);
label(rotate(-3)*"PP", (x + z)/2 + 2*trans); label(rotate(-5)*slant(0.5)*"RR", ((x + z) + (y + z))/2 + 2*trans); label(rotate(-85)*slant(-1)*"GG", ((x + z) + (x + y))/2 + 2*trans); [/asy]