protractor measuring angles geometry marked clearly from 180 degrees |
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| navigate by keyword : protractor ruler measure geometry mathematics measurement scale centimeter school measuring angle meter instrument compass tool math 180 degrees educational angles transparent supplies concept classroom mathematical equipment class degree student semi circle drawing precise learning teaching aid university graduation semicircle element engineering education millimeter length physics |
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| Protractor measuring angles in geometry, One is oriented vertically and the other horizontally, both marked clearly from 0 to 180 degrees with detailed lines and numbers, educational, math, science |
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