It is known that the ray OC is in the interior of horizontal angle ∠ AOB, and ∠ AOC ＞ BOC, OD bisection ∠ AOC, OE bisection ∠ BOC ① Compare the values of ∠ COD and ∠ Coe ② Can you find out the size of ∠ doe? If so, find out its degree; if not, please explain the reason Thanks for the process

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• 1. The angle AOB = 80 degrees, OC is a ray outside the angle AOB, OD bisects the angle BOC, OE bisects the angle AOC, and the angle DOE needs geometric language There is another problem If the angle AOB = 80 degrees is changed to angle AOB = a degrees, what is the law obtained by finding ∠ doe?
• 2. As shown in the figure, the known angle AOB = 90 degrees, the angle AOC is the acute angle. Od bisecting angle AOC, OE bisecting angle BOC. Calculate the degree of the angle doe? When the angle AOB = m degrees, the angle doe? Degree
• 3. As shown in the figure, known angle AOB = 90 degrees, angle AOC is acute angle, OD bisecting angle BOC, OE bisecting angle AOC, calculate the degree of angle doe
• 4. One day, Xiao Li walked to the Cultural Palace, 75 meters per minute when she went there, and 60 meters per minute when she returned. Xiao Li spent 36 minutes on the way back and forth. How many meters is it from Xiao Li's home to the cultural officer?
• 5. What is the physical knowledge of "enjoying the cool under a big tree"?
• 6. Explain "cool under big tree" with physics knowledge Mainly speaking, not too much
• 7. Explain the reason of "a big tree is good for enjoying the cool under the ground" with physics knowledge Explain with the change of state of matter
• 8. Why is it so cool under a big tree?
• 9. Why is it good to enjoy the cool under the big tree? Explain from the physical point of view One of the points is that the evaporation of water on the surface of leaves needs to absorb heat and play a cooling role. Our teacher also said that it is related to air flow. I didn't hear it clearly. Please help me to explain the relationship between enjoying the cool under the big tree and air flow
• 10. (Mudanjiang, 2013) as the saying goes, "it's good to enjoy the cool under a big tree", which shows that () A. Biological impact on the environment B. biological adaptation to the environment C. environmental change biology D. environmental restriction biology
• 11. As shown in the figure: given ABO = 60, OC is the bisector of AOB, OD and OE bisector BOC and AOC respectively. When OC rotates around o point in AOB, ask if the degree of DOE is the same as before? Through this process, what conclusion do you come to?
• 12. In the triangle ABC, the angle B is 90 degrees, the point O is the intersection of the bisectors of the three angles of the triangle ABC, OE is vertical AB, of is vertical AC, O is vertical AB, O is vertical AC, O is vertical AC, O is vertical AB, O is vertical AC, O is vertical AC, O is vertical AC, O is vertical AC, O is vertical AC, O is d. E, f are perpendicular feet, BC = 16cm, ab = 12cm, find the distance from point O to three sides AB, AC, BC
• 13. Triangle ABC and triangle DEB are equilateral triangles, e, B, C, on a straight line, CD, AE intersect o, connect Bo, 1) Verification of Bo bisector angle EOC 2) Explore the relationship between Ao, Co, Bo and prove it Sorry, there's no picture. The triangle BDE is small and ABC is large Triangle EBD on the left, ABC on the right
• 14. As shown in the figure, the triangle ABC is divided into two parts, AE = 3, EC = 2, BD = 3, DC = 1. What is the area ratio of the two parts
• 15. In the triangle ABC, DC: BD = 2:5, be and ad intersect at O, Bo: OE = 4, then Ce: EA =?
• 16. The triangle ABC is the inscribed triangle of circle O, AE is perpendicular to e, and D is the midpoint of - BC, connecting OA and AD
• 17. As shown in the figure, it is known that △ ABC is inscribed in circle O, AE bisects ∠ BAC, and ad ⊥ BC is at point D. connect OA, and verify ∠ OAE = ∠ DAE As shown in the figure, it is known that △ ABC is inscribed in circle O, AE bisects ∠ BAC, and ad ⊥ BC is connected to point D, OA is connected, and the verification is as follows: ∠ OAE = ∠ DAE
• 18. In triangle ABC, the angle BAC equals 135 degrees, ad is vertical to BC, the perpendicular foot is D, BD equals 4, CD equals 6, and the area of triangle ABC is calculated
• 19. In the triangle ABC, the angle c = 90 ° and the angle B = 45 ° ad bisects the angle BAC and intersects BC at the point D. It is proved that ab = AC + CD
• 20. In the isosceles RT triangle ABC, ab = AC, angle BAC = 90 degrees, be bisection angle BAC intersects AC at e, CD is made through C, be is perpendicular to D, and ad is connected