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  1. The ratio of circumradius and radius of an equilateral triangle is
    1. 1 : 2
    2. 3 : 1
    3. 2 : 1
    4. 1 : 3
Correct Option: C

As we know that ,
In an equilateral triangle,

Circum-radius =
a
√3

In-radius =
a
2√3

∴ Required ratio = Circum-radius : In-radius
∴ Required ratio =
a
 :
a
√32√3

Required ratio = 2 : 1


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