A circle is embedded in an equilateral triangle and the radius of circle is 10cm. The angle formed by the vertex and the centre of circle is 30⁰. find the perimeter of the triangle.
![\cos(30 ^{0} ) = \frac{ \sqrt[]{3} }{2}](https://tex.z-dn.net/?f=+%5Ccos%2830+%5E%7B0%7D+%29+%3D+++%5Cfrac%7B+%5Csqrt%5B%5D%7B3%7D+%7D%7B2%7D+ "\cos(30 ^{0} ) = \frac{ \sqrt[]{3} }{2}")
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