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Authoritative PPT Summary
"Properties of Parallel Lines" Proof of Parallel Lines PPT download, 17 pages in total.
Part One Content: Basic Knowledge Key Points
Knowledge point: Properties of parallel lines
1. As shown in the figure, if ∠1+∠2=180°, then the following conclusion is correct (C)
A.∠1=∠3 B.∠2=∠4
C.∠3+∠4=180° D.∠2+∠3=180°
The Nature of Parallel Lines PPT, Part 2: Improvement of Comprehensive Ability
8. As shown in the figure, ∠C=∠3, ∠2=80°, ∠1+∠3=140°, ∠A=∠D, then the degree of ∠B is (B)
A.80° B.40° C.60° D.Unable to determine
9. (Textbook Motif Variation) As shown in the figure, both sides OA and OB of ∠AOB are plane reflectors, ∠AOB=40°. There is a point P on the ray OB, and a beam of light is emitted from point P and passes through the point on OA After the Q point is reflected, the reflected light QR is exactly parallel to OB, then the degree of ∠QPB is (B)
A.60° B.80° C.100° D.120°
PPT on the nature of parallel lines, the third part: Expansion, exploration and breakthrough
14. As shown in Figure 1, point E is on the straight line AB, point F is on the straight line CD, EG⊥FG.
(1) If ∠BEG+∠DFG=90°, please judge the positional relationship between AB and CD and explain the reason.
(2) As shown in Figure 2, under the conclusion of (1), when EG⊥FG remains unchanged and there is a point M on EG, so that ∠MFG=2∠DFG, what is the quantitative relationship between ∠BEG and ∠MFD? And Give reasons.
(3) As shown in Figure 2, if you move point M so that ∠MFG=n∠DFG, please directly write the quantitative relationship between ∠BEG and ∠MFD.
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"Properties of Parallel Lines" Proof of Parallel Lines PPT teaching courseware:
"Properties of Parallel Lines" Proof of Parallel Lines PPT teaching courseware, 29 pages in total. The first part of the content: Learning objectives The properties of parallel lines The relationship between the properties of parallel lines and judgment... ... The properties of parallel lines PPT, the second part of the content: Understanding new knowledge Knowledge points...
"Properties of Parallel Lines" Proof of Parallel Lines PPT:
"Properties of Parallel Lines" Proof of Parallel Lines PPT, 27 pages in total. Part One: Learning Objectives 1. Understand and master the axioms and theorems of the properties of parallel lines. (Key points) 2. Be able to skillfully use the properties of parallel lines to conduct simple reasoning and proof. (Difficulty) .....
"Properties of Parallel Lines" PPT download of intersecting lines and parallel lines (Lesson 2):
"Properties of Parallel Lines" PPT Download of Intersecting Lines and Parallel Lines (Lesson 2) Part One: Think About It 1. Judgment Method of Parallel Lines 4: If a∥b, b∥c, then a∥c. (Parallel Two straight lines parallel to the same straight line) 2. Do some research on the properties of parallel lines..