Diesel Law Exam No. 1 Questions taken from the Pennsylvania Bituminous Mine Officials Exam Study Guide Progress Indicator: Question 2 of 15 2.  DETERMINE THE AREA OF A MINE ENTRY THAT IS 3 FOOT HIGH, IS 20 FEET WIDE ACROSS THE TOP, AND IS 22 FEET WIDE ACROSS THE BOTTOM: Choices: 61 square feet 63 square feet 65 square feet 67 square feet