Use a 7-meter-long rope to circle the hall pillar for 2 times, with 0.72 meters left. What is the floor area of this pillar?
(7-0.72) △ 2 △ 3.14 △ 2, = 6.28 △ 2 △ 3.14 △ 2, = 1 △ 2, = 0.5 (m); 3.14 × 0.52, = 3.14 × 0.25, = 0.785 (M2); a: the floor area of this column is 0.785 m2
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