"Angle" basic plane graphics PPT

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"Angle" basic plane graphics PPT

Part One Content: Basic Knowledge Key Points

Knowledge point 1: The concept and representation of angles

1. Which of the following statements about angles is correct (C)

A.Angle is two rays with common endpoints

B. The figure formed by two line segments is called an angle.

C. An angle can be viewed as a figure formed by a ray rotating around its endpoint.

D. Any angle can be represented by its vertex letter

2. Among the following four figures, the same angle can be expressed in three ways: ∠1, ∠AOB, and ∠O (C)

Knowledge point 2: Straight angles and circumferential angles

3. Which of the following statements about square angles and circumferential angles is correct (C)

A. A straight angle is a straight line

B. The circumference angle is a ray

C. Reversely extend the ray OA to form a straight angle

D. The sum of two acute angles is not necessarily less than a straight angle

4. There are the following statements: ① An angle less than 90° is an acute angle; ② An angle equal to 90° is a right angle; ③ An angle greater than 90° is an obtuse angle; ④ A straight angle is equal to 180°; ⑤ A circumferential angle is equal to 360°. The correct statement is Yes(C)

A.5 B.4 C.3 D.2

Corner PPT, the second part of the content: comprehensive ability improvement

8. Which of the following conversions of degrees, minutes and seconds is correct (D)

A.83.3°=83°30' B.37°12'36″=37.48°

C.24°24'24″=24.44° D.41.15°=41°9'

9. As shown in the figure, A starts from point A and walks to point B in the direction of 70° north and east, and person B starts from point A and walks to point C in the direction of 15° south and west, then the degree of ∠BAC is ( C )

A.85° B.160°

C.125° D.105°

10. At the following times, the minute hand and the hour hand on the clock face are at right angles: (B)

A.12:15 B.9:00

C.3:30 D.6:45

11. Xiaoying uses a magnifying glass to look at an angle of 20°. The magnification factor is 3 times. The angle Xiaoying sees is 20°.

12. As shown in the figure, there are 2 straight angles in the figure, they are ∠ECA, ∠CAD, and there are 5 angles smaller than the straight angles.

13. (Adapted) In the same plane, ∠AOB=140°, draw ray OC through point O, so that ∠BOC=100°, then the size of ∠AOC is 40° or 120° (0°<∠AOC<180° ).

14.As shown in the picture, please express the angles in the picture in different ways and fill in the table below.

Corner PPT, the third part of the content: Expansion, exploration and breakthrough

18. Observe the picture below and answer the following questions:

(1) How many corners are there in Figure 1?

(2) How many corners are there in Figure 2?

(3) How many corners are there in Figure 3?

(4) By analogy, as shown in Figure 4, if there are n rays in an angle, how many angles are there in total?

Keywords: Free download of Beijing Normal University edition seventh-grade mathematics PPT courseware for the first volume, corner PPT download, basic plane graphics PPT download, .PPT format;

For more information about the "Basic Plane Figures Angle" PPT courseware, please click on the Basic Plane Figures PPT Angle PPT tab.

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Update Time: 2024-09-24

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