Let $O$ and $H$ be the circumcenter and orthocenter of triangle $ABC$, respectively.  Let $a$, $b$, and $c$ denote the side lengths, and let $R$ denote the circumradius.  Find $OH^2$ if $R = 7$ and $a^2 + b^2 + c^2 = 29$.
Question:
Let $O$ and $H$ be the circumcenter and orthocenter of triangle $ABC$, respectively.  Let $a$, $b$, and $c$ denote the side lengths, and let $R$ denote the circumradius.  Find $OH^2$ if $R = 7$ and $a^2 + b^2 + c^2 = 29$.
Answer:
Let's think step by step.

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Let $O$ and $H$ be the circumcenter and orthocenter of triangle $ABC$, respectively.  Let $a$, $b$, and $c$ denote the side lengths, and let $R$ denote the circumradius.  Find $OH^2$ if $R = 7$ and $a^2 + b^2 + c^2 = 29$.
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