What’s the area of a regular pentagon with a side length of 4 meters ?

What is the volume of this container?

The complement of an angle is one-sixth the measure of the supplement of the angle. what is the measure of the complement angle?

Triangles abc and dfg are given. find the lengths of all other sides of these triangles if: b ∠a≅∠d, ab·dg=ac·df, ac=7 cm, bc=15 cm, fg=20 cm, and df-ab=3 cm.