How should stairs and steps be calculated The known conditions are: 1. Residential indoor stairs 2. Plane space 6 square meters (3 meters long and 2 meters wide) 3. Indoor height 3.6 meters Excuse me: 1. Can I make a circular staircase? 2. If I can, how wide should I be? How many steps should I take to get up? What is the best step?

For a 3.6-meter-high residence, if circular staircase is used, the height of the first staircase is 200 mm and the width is 18 stairs in total. The central width of the first staircase is 240 mm and the staircase is semicircular, so circular staircase can be used

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20. Oral arithmetic (score) An offer score that can be reduced 1 / 12 × 6 = 2 / 33 × 11= 4 / 5 × 5 / 8 = 1 / 3 + 3 / 5= 4 / 9 × 2 = 3 / 24 × 8= 20 / 21 × 14 / 15= 1 / 3 × 2 / 5 = 2 / 3 × 2 / 3= 5 out of 17 × 0 = 6 out of 1 × 7= 9 of 14 × 7 of 6 = 8 of 9 × 5 of 12= 5 / 6 × 3 / 4 = 2 / 3-1 / 2=