"Busy Construction Site" PPT Courseware 2

Description

"Busy Construction Site" PPT Courseware 2

learning target:

1. Recognize angles and master the classification of acute angles, right angles, obtuse angles, straight angles and circumferential angles. And know the relationship between right angles, square angles and circumferential angles.

2. Be able to use a protractor to measure angles.

3. Be able to use a protractor to draw angles of specified degrees.

Acute angle (an angle smaller than a right angle)

Right angle (an angle with two sides perpendicular to each other)

Obtuse angle (an angle greater than a right angle but less than a straight angle)

Straight angle (the angle formed when the two sides are rotated into a straight line)

Circumferential angle (the angle formed by rotating one side and reuniting the two sides)

Try drawing a 65° angle.

(1) Draw a ray so that the center of the protractor coincides with the endpoint of the ray, and the 0 scale line coincides with the ray.

(2) Click a point at the 65° scale line of the protractor.

(3) Taking the endpoint of the drawn ray as the endpoint, draw another ray through the point just drawn.

(4) After drawing, mark the corners with symbols and write the degrees.

Understand the steps of measuring angles with a protractor:

1. Place the protractor on top of the angle; make the center of the protractor coincide with the vertex of the angle;

2. The 0º scale line coincides with one side of the angle;

3. The angle corresponds to the scale that the other side corresponds to on the protractor. (When reading, be sure to distinguish between the inner and outer scale lines of the protractor!)

Understand the steps to draw angles with a protractor:

1. Draw a ray so that the center of the protractor coincides with the endpoint of the ray, and the 0° scale line coincides with the ray.

2. Place a point on the protractor angle scale.

3. Taking the endpoint of the ray as the endpoint, draw another ray through the point just drawn.

4. After drawing, mark the angle symbols and degrees.

after class homework:

1. Read the measure of each angle.

2. Measure and compare.

3. Draw angles of 30°, 45°, 90°, and 120°.

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Update Time: 2024-09-11

This template belongs to Mathematics courseware Qingdao Edition Fourth Grade Mathematics Volume 1 industry PPT template

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