At the toys store 4 toy cars cost $3.16 How much does it cost to buy 25 toy cars

Given: ac and db are diameters. m∠3=

What is the missing step in this proof ?

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex