## Elementary Geometry for College Students (7th Edition) Clone

$\phi=47 ^{\circ}$
First, draw each of the diagonal. The length of 1/2 the diagonal is 5.5 in. Since the length of the side is 6 in, we find: $\phi /2 = cos^-1(5.5/6)$ Note that the angle is divided by two since this represents only 1/2 of the angle. Thus, we find: $\phi=47^{\circ}$