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multiplication table - graphlike arrangement used to memorize products of each number in series, usu. 1 through 12, multiplied by each number in same series
protractor - instrument used to measure and lay down angles in drawing
quadrille - (adj) marked or ruled with squares for making graphs
ruler - straight-edged strip of hard material, used to measure distances and draw straight lines
slide rule - instrument consisting of ruler and slide, each graduated with similar logarithmic scales used for calculations
trammel - mechanical device used to generate curve from fixed point
Venn diagram - diagram that uses overlapping circles to show relationship between sets