triangle with measuring length markings blackboard top view space for text |
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| navigate by keyword : accessories angle background black blackboard centimeter chalk chalkboard college color copy design dirty drafting drawing education engineering equipment geometry item knowledge learn learning length markings math mathematical mathematics measure measurement measuring number object protractor ruler school science shape space stationery study supplies teach text tool top triangle university view work |
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| Triangle with measuring length markings on blackboard, top view. |
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