Maneesh wrote:

I understand how B is correct. I don't see how A is correct plz explain

Consider these truths:

1. Equilateral triangle meaning all angles 60degrees, correct ?

2. radious of inner circle + radious of circumcircle = perpendicular of equilateral triangle

3. perpendicular of an equilateral triangle = median of equilateral triangle = perpendicular bisector of equilateral triangle

4. thus, Circumcenter = orthocenter = incenter

5. and any side of an equilateral triangle = 2 * (perpendicular/ root 3)

cheers,

Dharmin

_________________

Perseverance, Hard Work and self confidence