Multiply numerator and denominator by $\sqrt{3} + 1$:

February 22, 2026

$Multiply numerator and denominator by $\sqrt{3} + 1$:$

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Let $a = 45^\circ$, $b = 30^\circ$, so:
\tan 75^\circ = \tan(45^\circ + 30^\circ) = \frac{\tan 45^\circ + \tan 30^\circ}{1 - \tan 45^\circ \tan 30^\circ}
= \frac{1 + \frac{1}{\sqrt{3}}}{1 - 1 \cdot \frac{1}{\sqrt{3}}} = \frac{\frac{\sqrt{3} + 1}{\sqrt{3}}}{\frac{\sqrt{3} - 1}{\sqrt{3}}} = \frac{\sqrt{3} + 1}{\sqrt{3} - 1}
= \frac{(\sqrt{3} + 1)^2}{(\sqrt{3} - 1)(\sqrt{3} + 1)} = \frac{3 + 2\sqrt{3} + 1}{3 - 1} = \frac{4 + 2\sqrt{3}}{2} = 2 + \sqrt{3}
\boxed{2 + \sqrt{3}}
Question: A historian discovers a triangular tablet with sides 17 cm, 25 cm, and 28 cm. What is the radius of the circumscribed circle around the triangle?

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