An equilateral triangle has a side of 18 cm. find the in-radius and circum-radius of the triangle (in cm).
Explanation:
In an equilateral triangle of side ‘a’.
Inradius = a/2√3 Circumradius = a/√3
⇒ For the given equilateral triangle
Inradius = 18/2√3 = 3√3
Circumradius = 18/√3 = 6√3
Hence, option (c).
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