A tetrahedron is a $3D$ solid with all four faces equilateral triangles. Find the surface area of a tetrahedron with side length $7 \mathrm{cm}$.

This pyramid has a square base with side $30 \mathrm{cm}$ and total surface area $2400{ \mathrm{cm}}^2$. Find its height.  [Enter the value excluding units]

These two square-based pyramids are mathematically similar. 

Pyramid $A$ has surface area $64{ \mathrm{cm}}^2$. Calculate the surface area of Pyramid $B$.  [Enter the value excluding units]

Find the surface area of the following solid cone. If necessary, round your answer to $3$ significant figures.

Find the surface area of the following solid cone. If necessary, round your answer to $3$ significant figures.

The diagram shows the dimensions of a paper cup. Calculate the area of paper used to make the cup.

Find the surface area of the following sphere. If necessary, round your answer to $3$ significant figures.

Find the surface area of the following sphere. If necessary, round your answer to $3$ significant figures.

Calculate the surface area of the following solid.