| 21. | Now measure the angle between the side crosses and the center cross with a protractor.
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| 22. | The Irregular Polygon canvases and Protractor series further extended the concept of the shaped canvas.
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| 23. | Some protractors are simple half-discs.
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| 24. | Otis patented the perspective protractor in 1815.
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| 25. | With compasses and protractors, he calculates wind directions and plots each storm's path.
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| 26. | Better order the protractors and compasses.
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| 27. | Drafting machines use pre-calibrated scales and built in protractors to allow accurate drawing measurement.
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| 28. | More commonly the set square bears the markings of a ruler and a half circle protractor.
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| 29. | What you need is a protractor.
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| 30. | The cleavage angles can be measured with a contact goniometer, which is similar to a protractor.
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