Math Gold Medalist

Lor

2023 AMC 10B

Problem 7

Square $ABCD$ is rotated $20^{\circ}$ clockwise about its center to obtain square $EFGH$, as shown below. What is the degree measure of $\angle{EAB}$?

[asy] size(170); defaultpen(linewidth(0.6)); real r = 25; draw(dir(135)--dir(45)--dir(315)--dir(225)--cycle); draw(dir(135-r)--dir(45-r)--dir(315-r)--dir(225-r)--cycle); label("$A$",dir(135),NW); label("$B$",dir(45),NE); label("$C$",dir(315),SE); label("$D$",dir(225),SW); label("$E$",dir(135-r),N); label("$F$",dir(45-r),E); label("$G$",dir(315-r),S); label("$H$",dir(225-r),W); [/asy]

$\textbf{(A) }24^{\circ}\qquad\textbf{(B) }35^{\circ}\qquad\textbf{(C) }30^{\circ}\qquad\textbf{(D) }32^{\circ}\qquad\textbf{(E) }20^{\circ}$

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   Solution