The square defg is the inscribed square of △ ABC, D is on ab. G is on AC, e and F are on BC, am ⊥ BC is on M, intersecting DG is on H. if ah is 4 and the side length of the square is 6, the length of BC is calculated

The length of BC is 15

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1. The side length of equilateral △ ABC is a, and the area of inscribed square defg of its inscribed circle is obtained
2. In RT △ ABC, a = 30.01, ∠ B = 80 ° 24 'and ∠ C = 90 °, right triangle can be solved according to the following conditions
3. In RT △ ABC, ∠ C = 90 °, a right triangle is solved by the following conditions (1) If we know that a = 4 times radical 3, B = 2 times radical 3, then C =? (2) If a = 10, C = 10 times the root 2, then ∠ B =? (3) If C = 20 and a = 60 ° are known, then a =? (4) If B = 35 and a = 45 ° are known, then a =?
4. As shown in the figure, ab = De, AC ∥ DF, BC ∥ EF
5. In △ ABC, ab = AC, points D, e and F are on the sides of AB, BC and AC respectively, de = DF,
6. In the triangle ABC, ab = AC, points D, e and F are on the sides of AB, BC and AC respectively. De = DF and EDF = angle a are known. Find out the similar triangles in the graph and prove them
7. It is known that: as shown in the figure, in △ ABC, ∠ B = ∠ C, points D, e and F are points on edges BC, AB and AC respectively, be = CD, connecting de and DF, with ∠ EDF = ∠ C, then are de and DF equal? Try to explain the reason
8. It is known that: as shown in the figure, in △ ABC, ∠ B = ∠ C, points D, e and F are points on edges BC, AB and AC respectively, be = CD, connecting de and DF, with ∠ EDF = ∠ C, then are de and DF equal? Try to explain the reason
9. As shown in the figure, △ ABC, D is the midpoint of BC, e and F are two points on the edge of AB and AC respectively, ed ⊥ FD, which proves that be + CF > EF
10. As shown in the figure, in △ ABC, BD bisects ∠ ABC, de ‖ BC intersects AB at point E, EF ‖ AC intersects BC at point F. try to guess the size relationship between be and CF, and explain the reasons, as shown in figure.doc
11. As shown in the figure, the area of triangle ABC is 120 square centimeters, D is the midpoint of BC & nbsp;, AE = 13be, EF = 12fd, then the area of triangle AFD is______ Square centimeter
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13. Xiaoming's father drew a 1:200 scale plan for a site and asked Xiaoming, "do you know how many times the actual area of the site is the size of the plan
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15. Master Zhao measured a rectangular teacher's room on a 1:500 scale plan. It is 4cm long and 2cm wide 1: Find the area on the map and the actual area of this classroom 2: write the ratio of the area on the map and the actual area, and compare it with the scale. What do you find?
16. On the plan with a scale of 1; 100, it is measured that Xiaolan's bedroom is 4cm long and 3cm wide; what is the actual distance between Xiaolan's bedroom Who knows
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18. Divide the 2-meter-long rope into 5 sections. How many parts of the total length is each section? How many meters is each section?
19. Divide a 4-meter rope into 5 equal parts, each of which is long______ Each piece is full length (& nbsp; & nbsp; & nbsp;) (& nbsp; & nbsp;)
20. Divide the 5-meter-long rope into 4 sections. What is the length of each section? What is the length of each section?