Realated Questions
A semicircular piece of paper (with radius 7 cm) is folded along the diameter to form a cone such that he centre of the semicircle becomes the vertex of the cone.If the base of the cone is covered by a circular paper lid, what is the total surface area of the cone ?

There is a square park with sides 20 m, and there are 2 diagonal paths that are√2 m wide.Find the area of the park without the paths.
What is the minimum length of a string with which one can surround a triangle of area 36√3 cm?