The circumference of a rectangle is 40cm. The width is ACM and the length is cm

40÷2-a
=20-a cm

RELATED INFORMATIONS

1. What fraction of an hour is 2 hours 15 minutes RT is a short answer question, please don't give an answer 3Q directly
2. Four hours and fifteen minutes are equal to () hours
3. What is 2.3 hours and 15 minutes
4. How many hours is three hours and fifteen minutes
5. 2.15 hours=______ Points
6. For children's day, the number of chorus competition in May 1 classes is 3/2 in class 52, and 40 in two classes. How many people in the two classes compete in the competition?
7. There are 30 boys and 24 girls in class 52. (1) the number of girls is a fraction of the number of boys, and the number of boys is the whole class
8. The number of extracurricular books read by the students of class 52 in winter vacation accounts for a few percent of the total number of students in the class Three or more than one tenth 1. Have all the students of class 52 participated in the reading activities? Why? What questions can you ask
9. There are two classes in Grade 5 of Guangming primary school, with 90 students, of which 54 are in class 51. What is the proportion of class 51 to the total number of grade 5? What is the proportion of class 52 to the total number of grade 5?
10. The number of students in class 52 is five sixths of that in class 51. How many times is the number of students in class 51? There are two classes How many parts of the total number of the two classes
11. The center of the ellipse is at the origin of the coordinate, the focus is on the y-axis, the focal length is 8, and the standard equation of the ellipse is obtained by passing through the point (3.0)
12. The usage of dashes: 1. Explanation; 2. Progressive meaning; 3. Turning meaning; 4. Continuation of sound; 5. Beginning and ending A. The express train from Beijing to Wuhan can arrive in 12 hours. B. We are Chinese, we love our motherland. C. We will never forget that day - October 12, 1952. D. I'd like to wear this prison. E. he doesn't like to travel in the park by coach unless he wants to show off his new clothes
13. The displacement of a particle in the first △ t time is S1, and the displacement in the second △ t time is S2. Calculate the average velocity and the instantaneous velocity in the middle time The displacement of a particle is S1 in the first △ t time and S2 in the second △ t time The average speed in these two periods___________ The instantaneous velocity at the middle of the two periods______________
14. Simplification: - P & sup2; cos180 ° + qsin9 ° - 2pqcos0 ° Simplification - P & sup2; cos180 ° + qsin9 ° - 2pqcos0 °
15. A regular prism has 2010 edges, one side edge is 10cm long, and one bottom edge is 1cm long. How many prisms is this?
16. If the circumference of a circle is 12.56 meters, what is its radius______ The area is______ ．
17. Answers to the 16th issue of mathematics learning report for Grade Seven
18. A sector with a radius of 30 cm and a central angle of 120 ° is used to form the side of a cone. What is the total area of the cone
19. How to calculate instantaneous velocity in Physics
20. A rectangle and a square of equal area have larger sides