Know the general equation of a circle and the formula for calculating the radius and center coordinates of a circle

The general equation of a circle is X & # 178; + Y & # 178; + DX + ey + F = 0 (D & # 178; + E & # 178; - 4f & gt; 0), where the center coordinates are (- D / 2, - E / 2) radius

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1. A rope is six meters long and divided into eight sections on average. How long is each section? How many parts of each section?
2. Is 10000 square meters equal to one hectare?
3. Who can solve the number reasoning problem 16,8,8,12,24,32,60
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5. In an equilateral triangle ABC, P is a point on edge AB, q is a point on edge AC, and AP = CQ. The distance between point a and the midpoint m of line PQ is 19 cm, then the distance between point P and point C is? (draw the picture by yourself, the original question is this.) Note: there is no need to draw a picture when answering You can't assume it
6. Stock calculation A stock is a fixed growth stock with an annual growth rate of 5%. This year, it just received a dividend of 8 yuan, and the risk-free rate of return is 10%. The average rate of return of all stocks in the market is 18%, and the β value of the stock is 1.5, and the intrinsic value of the stock is () A、50.05 B、49.41 C、45.23 D．61.71
7. How to convert ml and G? Is 500 g equal to 500 ml?
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12. Use the four numbers 1, 3, 3 and 8 to form the formula of 24
13. 7 / 8 of a number is 14. What's the number
14. Given the sequence {an}, A1 = 1 / 3, the relation between Sn and an is Sn = n multiplied by (2n-1) multiplied by an, the general formula of {an} is obtained
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16. X = () y = ()
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20. A square with a side length of 10 cm is used to draw a semicircle with four sides as the diameter. What is the area of intersection of these four arcs?