_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Class (in English)

First, fill in the blanks. (65438+ 0 point per grid)

The 1. line segment has () endpoints and is a part of ().

2. The figure composed of two rays drawn from a point is called ().

This point is called angle (), and these two rays are called angle ().

3. Divide the semicircle into 180 parts, and the right angle of each part is called ().

4. Use () to measure the angle, and the commonly used unit for calculating the angle is ().

Indicated by the symbol ().

5. Half of a flat angle is () degrees, and it is () angle.

6. () Angle > () Angle > () Angle > () Angle > () Angle

7. There is an angle that is twice 45 degrees. This angle is () degrees, and it is () angle.

When the clock face is (), the hour hand and the minute hand are at right angles.

8. An angle smaller than right angle by 135 is an angle of () degrees, which is smaller than right angle by () degrees.

9.∠ 1+∠ 2+∠3= 180, where ∠ 1 = 52 and ∠ 2 = 46, ∠3= ().

10. 1 fillet = () flat angle = () right angle.

Second, choose the correct answer and fill in (). (2 points for each question)

1. Extend one end of () indefinitely and get a ray.

A. straight line B. line segment C. ray

2. The two sides of the angle form a (), and the angle formed at this time is called a right angle.

A. straight line B. ray C. line segment

3.9 1 angle is ().

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

4. The relationship between the size of the angle and the edge is ().

A. the shorter the side, the smaller the angle. B. The longer the side, the smaller the angle. C. the size of the angle has nothing to do with the length of the side.

5. If 1+ 2= 2+ 3, 1 = 35, then 3= ().

A.90 B.55 C.35

6. The angle that a pair of triangles can draw is ().

a、 160 B、40 C、 120

3. Judge, please tick "√" and "×" in brackets. (5 points)

1. Only one straight line can be drawn after a little bit. ( )

2. A ray is 6 cm long. ( )

The light emitted by a flashlight can be regarded as a line segment. ( )

The straight line is longer than the light. ( )

5. A right angle has no vertex. ( )

Fourth, fill the angles of the following degrees into four circles as required. (12)

15 26 45 180 125 179 90 135 36 150 164 89

Acute angle (degree),

Obtuse angle (), right angle (), right angle ().

Verb (abbreviation of verb) actual operation:

1, measure the degree of each angle with a protractor. (8 points)

2. Fill in the angle formed by every two triangles in the picture. (9 points)

3. Write down the time on each clock face and measure the angle formed by the hour hand and the minute hand. (8 points)

4. Draw a picture with a protractor. (9 points)

( 1)40 (2) 165 (3)98

6. Find the degrees of the following angles. (14)

Known: 1 = 45, found: 2.

2.

Known: 1 = 90, 2 = 30.

Question: How many degrees is 3?

3.

Known: 1 = 135.

Question: How many degrees are 2, 3 and 4?

Seven, expansion: test your eyesight.

How many corners are there in the picture below?

() Angle () Angle.

(2) Statistical line segments.

() line segment () line segment