A flat angle equals () right angles, one sixth of the circumference equals () right angles?

]Is a flat angle equal to (2) right angles, one sixth of the circumference equal to (2 / 3) of the right angle?

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1. A circumference is equal to several flat angles, which is several times of a right angle
2. The horizontal angle is equal to []; the perimeter angle is equal to []; 1 ° = [] ', 1' = [] '; 1' = [] '; 1' = [] '
3. Two () angles are equal to a circumference. Four () angles are equal to a circumference. Two () angles are equal to a flat angle. Arrange acute angles and circumference from small to large
4. What is an obtuse angle? Are perimeter and horizontal angles also obtuse angles?
5. The obtuse angle among the following angles is () a.1/6 circumference b.3/5 horizontal angle c.4/3 horizontal angle d.9/10 right angle
6. What is the degree of 1 / 4 of a horizontal angle? What is the degree of 1 / 4 of a perimeter angle? What is the degree of 1 / 2 of a right angle? What is the angle
7. One fourth of a circumference is () degree, and five sixth of a horizontal angle is () degree
8. One sixth of the circumference is () of the right angle, and twice of the horizontal angle is () degree
9. What percentage is 8 grams more than 5 grams?
10. 5 after reducing its ()% to 3, () is 10% less than 60%, and 30g is ()% less than 80g
11. What is the proportion of 3 / 8 to 5 / 8?
12. What's the ratio of 5 / 8 to 5 / 12
13. B is 5 / 8 of a, and a is a fraction of B
14. 5 is a fraction of 8
15. An 8-meter-long rope is divided into 4 parts of a meter, with an average of () parts. Each part is a fraction of 8 meters, and each part is a fraction of 1 meter What's the percentage of each meter
16. Divide the 3-meter-long wire into 8 sections, each of which is 1 meter long______ It's three meters______ ．
17. 1 / 8 of 5 meters is equal to a fraction of 1 meter How do you calculate that?
18. A barrel of oil, the first time to use 2 / 5, the second time to use 3 / 8, the second time to use how much of this barrel of oil?
19. According to 1.2 × 4 = 0.6 × 8, it can be written in proportion______ ：______ =______ ：______ ．
20. What is 2.5