Acute triangle test site: the concept of acute triangle ratio (sine, cosine, tangent and cotangent of acute angle), triangle ratio of 30 degrees, 45 degrees and 60 degrees.
Test center: solving right triangle and its application
Assessment requirements: (1) Understand the meaning of solving right triangle; (2) We can use acute angle complementation, acute angle triangle ratio and Pythagorean theorem to solve right triangle and some simple practical problems, especially we should skillfully use the value of special acute angle triangle ratio to solve right triangle.
similar triangles
Test center: similar triangles's concept, the meaning of similarity ratio, and the enlargement and reduction of drawing graphics.
Assessment requirements: (1) Understand the concept of similarity; (2) Grasp the characteristics of similar figures and the significance of similarity ratio, and zoom in and out known figures as required.
Test sites: the proportion theorem of parallel lines and the related theorem of parallel lines on one side of a triangle.
Examination requirements: Use the proportional theorem of parallel lines to understand and solve some geometric proofs and geometric calculations.
Note: An edge judged to be parallel cannot be used as the corresponding line segment in the condition in proportion.
Test site: similar triangles's concept
Evaluation requirements: Based on the concept of similar triangles, master the characteristics of similar triangles and understand the definition of similar triangles.
Inspection Center: similar triangles's Judgment, Nature and Application
Examination requirements: Master similar triangles's judgment theorem (including preliminary theorem, three judgment theorems, right triangle similarity judgment theorem) and its properties, and can apply it well.
Test center: the center of gravity of triangle
The formula of trigonometric function sin 30 = 1/2.
sin45 =√2/2
sin60 =√3/2
cos30 =√3/2
cos45 =√2/2
cos60 = 1/2
tan30 =√3/3
tan45 = 1
tan60 =√3
[h，0]
[h，k]
【-b/2a，(4ac-b？ )/4a]
The above is a summary of the key knowledge points of junior one mathematics that I sorted out for you.