Find the circumcircle radius $ R $ of an equilateral triangle if side $a = 7$.
Answer
$R = \frac{ 7 \sqrt{ 3}}{ 3 }$
Explanation
To find circumradius $ R $ use formula:
$$ R = \dfrac{ \sqrt{ 3 } \cdot a }{ 3 } $$After substituting $ a = 7 $ we have:
$$ R = \dfrac{ \sqrt{ 3 } \cdot 7 }{ 3 } $$$$ R = \dfrac{ 7 \sqrt{ 3 } }{ 3 } $$ $$ R = \frac{ 7 \sqrt{ 3}}{ 3 } $$This page was created using
Equilateral Triangle Calculator