Draw a venn diagram with one circle labled quadrilateral and the other circle labled polygons with at least 1 right angle. draw at least two shapes in each section of the of the diagram. explain why drew the shapes you chose in the overlapping section.

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?