1. The length of the straight line is (), and the line segment between two points on the straight line is called ().

2. A graph composed of two rays drawn from a point is called (), this point is called its (), and these two rays are called its ().

3. The two sides of the angle form a straight line, and the angle formed at this time is called (), which is () degrees.

4. The angle of107 is (), and that of 57 is ().

5. One acute angle in a right triangle is 35, and the other acute angle should be () degrees.

6. 1 fillet = () flat angle = () right angle.

7. In straight lines, line segments and rays, () has measurable length, () has no endpoint, and () has only one endpoint.

8. There are 12 squares on the clock face, and the square of the hour hand is () degrees. 1, the smaller angle between the hour hand and the minute hand is () degrees, and the larger angle between the hour hand and the minute hand is () degrees, at 4 o'clock.

9. Acute angle () 90, obtuse angle () 90 and less than (), right angle () 90.

Second, choose. (Fill in the serial number of the correct answer in brackets) (12 points)

1. In the same plane, the three points A, B and C are not on the same straight line, so you can draw a line segment () through these three points.

innumerable

2. You can draw a () straight line in a moment.

A.1b.2c. Countless.

3. Measure the angle with ().

A. triangle ruler B. ruler C. protractor

4. A () is 8 cm long.

A. line segment B. straight line C. ray

5. Three equal angles form a right angle, and these three angles must be ().

A. acute angle B. right angle C. obtuse angle

6. () is a straight line, () is a ray and () is a line segment.

Royal Air Force.

Third, the judge. (Mark "√" for the right and "×" for the wrong) (5 points)

1. Two points on a straight line divide the straight line into four rays. ( )

2. The sum of two acute angles must be greater than the right angle. ( )

3. The size of the angle has nothing to do with the length of the side, but only with the size of both sides of the angle. ( )

4. You can intercept countless line segments with the same length on a straight line. ( )

5. Thunder can measure the length. ( )

Fourth, even a company. (10)

Acute angle, right angle, oblique angle and fillet

180 90 60 55 360 133

Verb (abbreviation of verb) practical application. (20 points)

1. In a triangle, the two angles are 23 and 6 1 respectively. What is the other angle? What triangle is this triangle?

2. What is the smaller angle between the hour hand and the minute hand at 3pm? What is the angle between the hour hand and the minute hand at 6 o'clock? How about 9 o'clock?

3. Fold a semicircle in half and unfold it again (as shown below). How many degrees can you find on the map?

4. Mao Mao said: "Grandpa looked at a 40 angle with a magnifying glass that can be magnified twice, and the angle became 80." Do you think this statement is correct? Why?

5. Experimental primary school schedule: prepare at 8: 00 a.m., have classes at 8: 00 10, with class time of 45 minutes and recess10 minutes. How many right angles did the minute hand walk from one class to another at most? When is the second class? Say, draw the second hour hand and minute hand on the second surface below.

Scientific learning methods and reasonable review materials can help everyone learn mathematics better. I hope that the test questions prepared for you in Unit 4 of Grade 4 in primary school mathematics will help you!