Question 90

The inradius of a equilateral triangle is 10 cm. What is the circum-radius (in cm) of the same triangle?

Solution

For an equilateral triangle, ratio of circum radius and inradius = 2 : 1

=> $$\frac{R}{r}=\frac{2}{1}$$

Here, inradius = $$r=10$$ cm

=> $$\frac{R}{10}=\frac{2}{1}$$

=> $$r=10\times2=20$$ cm

=> Ans - (C)

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