Question A placard indicating hazardous materials is shaped like a: Answers Diamond. Triangle. Circle. Explanation Hazardous materials warning placards are diamond-shaped. Take a FREE Practice Test Now This questions appears in the following tests: Alabama HazMat , Alaska HazMat , Hawaii HazMat , Kentucky HazMat , Maine HazMat , New Hampshire HazMat , New Mexico HazMat , Rhode Island HazMat , Tennessee HazMat , Vermont HazMat , Washington HazMat ,