logolesson1

logolesson1内容摘要：

T 72] Did you notice a pattern?  The number after REPEAT is the number of sides.  Examine the number of repeats and the number of degrees. Try multiplying them together. Example: 4 (sides) x 90 (turn)  The sides x degrees should always be the same number in the samples you tried.  Could you use this information to make a 10sided figure? Click for a possible answer. Did you notice a pattern?  REPEAT 10 [FD 30 LT 36] should make a 10sided figure.  Why? Look at the “total turtle turns” below: REPEAT 3 [FD 30 LT 120] 3 x 120 = 360 REPEAT 6 [FD 30 LT 60] 6 x 60 = 360 REPEAT 8 [FD 30 LT 45] 8 x 45 = 360 REPEAT 5 [FD 30 LT 72] 5 x 72 = 360 REPEAT 10 [FD 30 LT 36] 10 x 36 = 360 } When the turtle makes a closed figure (no breaks in the sides), the total turns add up to 360 degrees. Logo and Critical Thinking  You have just seen an example of the use of Logo to enhance critical thinking.  Your students (and you, too) can be challenged to write the sequential steps needed to make shapes, look for patterns, predict outes…all part of critical thinking.  Watch for more examples of critical thinking as you learn Logo. Changing Things  Here is another prediction task for you.  You have seen that to make a square, you can use REPEAT 4 [FD 30 LT 90]  Do you think the same mands would work if you turned RT instead of LT?  How could you make a square larger? What would you have to change?  After you have made predictions, go to the next slide. Were you correct? REPEAT 4 [FD 30 LT 90] REPEAT 4 [FD 30 RT 90] REPEAT 4 [FD 10 LT 90] REPEAT 4 [FD 50 LT 90] Controlling the Logo “Pen”  When the Logo turtle moves, it usually draws with a “pen”.  This pen can be “down” (draws a line) or “up” (does not draw a line). If the pen is up, the turtle moves wit。