Work out the surface area of following shapes

Surface area is

Write the formula to find out the surface area of a solid hemisphere.

Find the surface area of a wooden box whose shape is of a cube, and if the edge of the box is 12cm.

Two cones with same base radius 8 cm and height 15 cm are joined together along their bases. Find the surface area of the shape so formed.

Prove that the surface area of a sphere is equal to the curved surface area of the circumscribed cylinder.

Work out the formulae for the following compounds : (a) Sodium oxide , (b) Calcium carbonate

How you would find the surface area of an open-top box that is shaped like a rectangular prism.

An open metallic bucket is the shape of a frustum of a cone mounted on a hollow cuylinderical base made of the same metallic sheet . The surface area of the metallic sheet used is equal to curved surface area of frustum of a cone + area of circular base + curved surface area of cylinder.

Surface area of a soap bubble is 1.3xx10^(-4) m^2 . The work done to doble the surface area will be ( Surface tension for soap solution = 3xx10^(-3) N//m )