This is a very simple representation for showing how you can use Sliders to manipulate objects in a variety of ways. For this exercise in particular, I've created some candles which melt in a given amount of time.
Properties of Quadrilaterals (#1)
Shadows in Perspective
hexagonal pattern 2
Finding Sides of Right-Angled Triangles
Solving Calculus Problems with Geogebra
Post shadow, lamp in front