Let the side of the equilateral triangle be s. ⇒ the radius of the circle that circumscribes the triangle (r)=s∕√3 Given the area of the circleπr2=π(
s
√3
)2=462
⇒s2=462×3×‌
7
22
=441⇒s=21
Required answer, the perimeter of the triangle =3s=3×21=63cm