The seventh grade volume mathematical mind map: the seventh grade volume triangular mathematical mind map: the relationship between variables; The seventh grade volume mathematical mind map: axial symmetry in life; The seventh grade volume mathematical mind map: preliminary probability; The knowledge points of parallel lines and intersecting lines in grade seven are1; The complementary angles of the same angle or equal angle are equal; The complementary angles of the same angle or the same angle are equal.
2, the vertex angles are equal
3, judge the conditions of two straight lines parallel:
1) At the same angle, two straight lines are parallel. (2) The internal dislocation angles are equal and the two straight lines are parallel. 3) The internal angles on the same side are complementary and the two straight lines are parallel. (4) If two straight lines are parallel to the third straight line, then the two straight lines are also parallel to each other.
4, the characteristics of parallel lines:
(1) At the same angle, two straight lines are parallel. (2) The internal dislocation angles are equal and the two straight lines are parallel. (3) The internal angles on the same side are complementary and the two straight lines are parallel.
5. Proposition:
(1) Concept proposition:
A statement that judges a thing is called a proposition.
(2) the composition of the proposition
Each proposition consists of two parts: the theme and the conclusion. The topic is what is known; The conclusion is derived from what is known. Propositions are often written? such as
So, what about fruit? The form of. With this form of proposition, with? What if? The beginning part is the title. So what? The beginning is the end.
6. Translation
Translation refers to moving a graph along a certain distance on a plane. This graphic movement is called translation, which does not change the shape and size of the object.
(1) Moving the whole graph along a straight line will produce a new graph with the same shape and size as the original graph.