Ask students to draw a square in Logo. Then ask them to draw a tilted square. Do the same for rectangles. Give students a procedure RECT that draws a rectangle when the two dimensions for the rectangle are given as input. Give the students a Logo procedure that draws figure A and let them test it on a computer.
Students take turns acting as the turtle on paper.
Battista, Michael T. and Douglas H. Clements. A Case for a Logo-based Elementary School Geometry Curriculum. Clements, Douglas H. and Michael T. Battista. In Handbook of Research on Mathematics Teaching, edited by D. A. Grouws. Kosslyn, Stephen M. Ghosts in the Mind's Machine.