Can someone it would be very much appreciated

Which math sentence can be used to determine if the triangle is a right triangle?

Which table shows a proportional relationship between miles traveled and gas used?

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