Cylinder a has radius (r) and height (h) as shown in the diagram. cylinder b has radius 2r and height 2h . how many times greater is the surface area of cylinder b than the surface area of cylinder a?

The speed of a falling object increases at a constant rate as time increases since the object was dropped. which graph could represent the relationship betweent time in seconds, and s, speed in meters per second? speed of a falling object object over time

How can you construct perpendicular lines and prove theorems about perpendicular lines

The anwser cause i do not understand just plez