The side of a regular dodecagon is 2 cm. The radius of the circumscrbed circle in cms. is :

Q.The side of a regular dodecagon is 2cm The radius of the circumscribed circle in is is cms, is.(A)4(sqrt(6)-sqrt(2))(B)sqrt(6)+sqrt(2)(C)2(sqrt(2))/(sqrt(3+1))(d)sqrt(6)-sqrt(2)

The perimeter of a regular pentagon of side 8 cm is

The area of a regular hexagon of side 2sqrt3 cm is :

The radius of the circumcircle of a right angled triangle is 15 cm and the radius of its inscribed circle is 6 cm. Find the sides of the triangle.