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Category | Format | Size |
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People's Education Press Seventh Grade Mathematics Volume 2 | pptx | 6 MB |
Description
"Properties of Parallel Lines" Intersecting Lines and Parallel Lines PPT Courseware 2
Properties of parallel lines:
Two parallel lines intersected by a third straight line have equal angles.
Simply put: two straight lines are parallel and have equal angles.
Two parallel lines are intercepted by a third straight line, and their interior angles are equal.
Simply put: two straight lines are parallel and their internal offset angles are equal.
Two parallel lines are intercepted by a third straight line, and the interior angles on the same side are complementary.
Simply put: two straight lines are parallel and interior angles on the same side are complementary.
Example 1. As shown in the figure: AB∥CD, AD∥BC are known. Fill in the blanks:
(1) ∵ AB∥CD,
∴∠1=_____(Two straight lines are parallel and their internal offset angles are equal.)
(2) ∵AD∥BC (known),
∴∠2=_____ (Two straight lines are parallel and their internal offset angles are equal.)
Do it
1. As shown in the figure: AB and CD are intercepted by EF, AB∥CD, ∠1=120o. Find the degrees of ∠4, ∠2 and ∠3.
Solution: ∵ AB∥CD
∠1=120o
∴ ∠4= ∠1 =120o
∠2= ∠1=120o
∠3=180°- ∠1= 180°-120°=60°
2. As shown in the figure, it is known that DE∥BC and CD are the bisectors of ∠ACB,
∠ACB=40°, then ∠EDC equals .
3. If two parallel lines are intercepted by a third straight line, then a set of bisectors of the same angle are mutually ( )
A.Perpendicular B.Parallel C.Coincident D.Intersection
4. As shown in the figure, CD∥AB, OE bisects ∠AOD, OF⊥OE, ∠D=50°, then ∠BOF is ( )
A.35° B.30° C.25° D.20°
5. As shown in the figure, AB∥CD, then ∠A+∠E+∠F+∠C is equal to ( )
A.180° B.360° C.540° D.720°
6. As shown in the figure, AB∥EF∥CD, EG∥BD, then
The angles in the figure that are equal to ∠1 (except ∠1) have a total of ( )
A.6 B.5 C.4 D.3
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For more information about the PPT courseware "Properties of Parallel Lines Intersecting Lines and Parallel Lines", please click on the Properties of Parallel Lines ppt Intersecting Lines and Parallel Lines ppt tag.
"Properties of Parallel Lines" PPT download:
"Properties of Parallel Lines" PPT Download Part 1 Content: Review Review What are the methods for determining parallel lines? How to identify parallel lines: (1) the angles of the same angles are equal, two straight lines are parallel (2) the internal angles are equal, the two straight lines are parallel (3) the internal angles on the same side are complementary, Two straight lines are parallel...
"Properties of Parallel Lines" PPT:
"Properties of Parallel Lines" PPT Part One Content: Knowledge Review 1. If B=1, according to _______________, we can get AD//BC 2. If 1=D, according to _______________, we can get AB//CD 3. If B+BCD=180, according to___..
"Properties of Parallel Lines" PPT courseware download:
"Properties of Parallel Lines" PPT courseware download Part 1 content: Do a hands-on experiment: Select any two parallel lines a, b on the prepared grid book (1) Draw a straight line c and parallel lines a, b arbitrarily intersect. (2) Choose any pair of co-positioned angles and measure them with a protractor...
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Update Time: 2024-09-08
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