Protractor
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A math tool used for measuring angles on blueprints.
Galleries
ProtractorsSource
William Dwight Whitney The Century Dictionary and Cyclopedia: An encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1889)
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2400×1472, 450.9 KiB
1024×628, 57.4 KiB
640×392, 28.6 KiB
320×196, 11.0 KiB