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This is an auto-checking exercise. You can use the tools shown in the lower right corner to complete the task shown on the left. If you need a hint, press the button with the question mark.
You can create exercises like this with Cinderella, and publish them on the web immediately. You do not need to know HTML for this.
Altitudes in a triangle Pythagoras' Theorem Optics Elevator Doors Perspective Drawings©1999 Jürgen Richter-Gebert & Ulrich Kortenkamp. Java and all Java-based trademarks and logos are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries. Cinderella is independent of Sun Microsystem, Inc. PostScript is a registered trademark of Adobe Systems, Inc. All other brand and product names are trademarks, registered trademarks or service marks of their respective holders.