Whats the area of the square pyramid
an electrician needs 2 rolls of electrical wire to wire each room in a house. How many rooms can he wire with 3/5 of a roll of wire?

look a the other question I just posted and help a sister out

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.