Sine Theorem 5 in Compulsory Mathematics in Senior High School Curriculum Standard Experimental Textbook (People's Education Edition)

Teaching emphases and difficulties

Teaching focus:

The discovery and proof of sine theorem; Simple application of sine theorem.

Teaching difficulties:

The conjecture process of sine theorem.

Teaching preparation:

Make multimedia courseware, students prepare calculators, rulers and protractors.

Interest is the best teacher. A good beginning of a class means success.

Half. So I introduce practical problems from students' daily life to stimulate students' thinking and stimulate students' thinking.

Students' thirst for knowledge leads them to solve the problem of right triangle. After solving the problem, they will ask some special questions.

Summarize the topic, draw a speculative conclusion-conjecture, cultivate students' ideology from special to general,

Cultivate students' creative thinking ability.