Teaching content:
Compulsory education curriculum standard experimental textbook, the first volume of junior two mathematics, pages 38 ~ 39.
Teaching objectives:
1. Let the students know the angle, judge the angle and know the names of each part of the angle by combining the life situation and operation activities.
2. Learn to draw angles with a ruler.
3. Cultivate students' practical ability and spirit of unity and cooperation.
Emphasis and difficulty in teaching: perception, judgment and drawing of angle.
Teaching process:
First, create situations and introduce new lessons.
Teachers play multimedia, guess numbers and reveal topics.
A preliminary understanding of the topic and angle of teachers' posting.
Second, contact the actual perception angle.
1. Theme map on page 38.
Look at the theme map, tell the angle on the object from the map, and initially perceive the angle.
2. Students look for angles from their own triangles.
Find each other's horns and point at them.
3. Life Find a corner from life.
Raise your hand and report.
Third, operate perception, explore new knowledge and understand angle components.
1. Folding angle.
Students explore the vertices and edges of the angle from their own angles.
2. The computer abstracts the corners of origami and learns the components of the corners.
3. Show the activity angle to make students feel that the angle has a size, and the size of the angle has nothing to do with the length of both sides.
(1) The teacher did magic to draw the activity angle.
(2) Hands-on operation angle.
(3) The discovery of life theory.
Fourth, draw corners.
1. Students explore the process of drawing corners.
2. Life says the process of drawing corners.
3. Watch the multimedia corner drawing process.
4. Draw the angle again.
Verb (abbreviation for verb) consolidation exercise
1. Judge.
2. Count the angles.
3. The size of the angle.
Sixth, expansion, games
Draw your favorite figure with the corners.
Seven. Summary after class