As shown in Figure 7, the right angle centers of two triangular plates are superposed together. (1) if the superposed angle BOC = n degrees (0 is smaller than n is smaller than 90), then the complement degree of angle AOD

(1) If the ratio of degree between ∠ DOB and ∠ doa is 2:11, the degree of ∠ BOC can be calculated; if ∠ DOB = 2x, then: ∠ DOA = 11x and ∠ DOA = ∠ DOB + ∠ AOB = 2x + 90 ° so: 11x = 2x + 90 ° so: x = 10 ° and ∠ BOC = 90 ° - DOB = 90 ° - 2x

RELATED INFORMATIONS

1. If the complement of an angle is three times the angle, then the degree of the angle is zero
2. Angle A and angle B complement each other, and angle a is 30 degrees larger than half of angle B. calculate the degree of angle A and angle B
3. In the quadrilateral ABCD, one angle equals two angles and three angles equals four angles In the quadrilateral ABCD, one angle equals two angles and three angles equals four angles
4. For a triangle, angle 1 is three times of angle 2, angle 3 is five times of angle 2, angle 1, angle 2, angle 3, how many degrees are each angle?
5. At present, the prices of five tea cups are 8.6, 5.4, 3, and three tea plates are 9.7 and 2, respectively How many kinds of tea sets at different prices can be made from one cup and one tray
6. How many decimeters is five meters?
7. How many centimeters is six meters?
8. How many centimeters is six meters
9. 6 m 4 cm = () M 4 jiao = () yuan 85 m=（ 6m 4cm = () M 4 jiao = () yuan 85m = () cm 1t 300kg - 790kg = () t 9 M 8 cm - 3 m 20 cm = () M
10. How many meters is 5 meters 45 centimeters
11. If the complement of an angle is equal to three times of the angle, find the degree of the angle. If the complement of an angle is three times of the remainder, find the degree of the angle If an angle is equal to half of its remainder, find the degree of the angle
12. The complement of an angle is 36 ° 35 ', and the degree of this angle is equal to
13. The complement of an angle is equal to half of the angle. Find the degree of the angle
14. It is known that angle A and angle B complement each other, and half of angle B is 30 degrees smaller than angle A. find the degree of angle A and angle B. why is angle a equal to 30?)
15. How to calculate (3x + 1) + (- X-2) (- 3x + 9) + (- 8 + 5x) (5x + 9) - (- 7x + 7)?
16. 8-5x=3x+9
17. 5X*7+3X*8=5X*7+9
18. The process of (3x + 7) / 4. - 1 = (5x + 5) / 6
19. - 3x + 0.5x = 100
20. -3x + 0.5x = 10