question: triangle:area
choices.label: A B C D
choices.text: trapezoid:tetrahedron line segment:circle cube:volume area:volume
explanation: a "triangle" has "area", and the "area" of a "triangle" can be calculated. there is no obvious logical relationship between "trapezoid" and "tetrahedron". there is no obvious logical relationship between "line segment" and "circle". the "cube" has "volume", and the "volume" of the "cube" can be calculated. both "area" and "volume" refer to the size of the space an object occupies, "area" has no "volume".
relation: triangle area R3.1
relation: cube volume R3.1
relation: area volume R2.4