Question
Find the circumcircle radius $ R $ of an equilateral triangle if side $a = 5\, \text{cm}$.
Answer
$\dfrac{ 5 \sqrt{ 3}}{ 3 }\, \text{cm}$
Explanation
To find circumradius $ R $ use formula:
$$ R = \dfrac{ \sqrt{ 3 } \cdot a }{ 3 } $$After substituting $a = 5\, \text{cm}$ we have:
$$ R = \dfrac{ \sqrt{ 3 } \cdot 5\, \text{cm} }{ 3 } $$$$ R = \dfrac{ 5 \sqrt{ 3 }\, \text{cm} }{ 3 } $$ $$ R = \frac{ 5 \sqrt{ 3}}{ 3 }\, \text{cm} $$This page was created using
Equilateral Triangle Calculator