"Determination of Parallelograms" Parallelogram PPT Download (Lesson 3) Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
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Authoritative PPT Summary
"Determination of Parallelograms" Parallelogram PPT download (Lesson 3), 21 pages in total.
learning target
Explore and prove the equality of parallel line segments sandwiched between parallel lines;
Use the property that parallel line segments between parallel lines are equal to solve related problems and understand the meaning of the distance between parallel lines.
Review and Thoughts
How to determine a parallelogram:
1.Definition method
A quadrilateral with two opposite sides that are parallel is a parallelogram.
2. Determination theorem
⑴A quadrilateral with two sets of opposite sides equal to each other is a parallelogram;
⑵A set of quadrilaterals whose opposite sides are parallel and equal is a parallelogram;
⑶A quadrilateral whose diagonals bisect each other is a parallelogram.
pre-learning
1. The common perpendicular segment between two parallel lines is ( )
A． 1 item B． 2 items c. Countless D. None of the above statements are correct
2. The distance between two parallel lines refers to their ( )
A. Perpendicular line B. Common vertical line segment
C. Common perpendicular line D. Length of common perpendicular line segment
3. In the same plane, if the straight line a∥b∥c, and the distance from straight line a to b is 5cm, and the distance from straight line b to c is 3cm, then the distance from straight line a to c is ( )
A.2cm B.8cm C.2cm or 8cm D. None of the above is correct
collaborative inquiry
Explore point one
Question 1: The picture below shows a section of straight rails. Through observation, what is the positional relationship between the two straight rails? What is the positional relationship between the sleepers sandwiched between the rails? What geometric shape do two sleepers and two straight rails form? Based on the nature of this figure, are the sleepers sandwiched between two straight rails the same length?
Question 2: It is known that straight line a//b passes through any two points A and B on straight line a and draws perpendicular lines to straight line b respectively. The straight line b intersects at point C and point D, as shown in the figure.
(1) What is the positional relationship between the straight lines AC and BD?
(2) Compare the lengths of line segments AC and BD.
Summary: If two straight lines are parallel to each other, and the distance from any point on one straight line to the other straight line is equal, this distance is called the distance between parallel lines.
Exploration point two
Question 1: Are parallel line segments sandwiched between parallel lines necessarily equal? Please explain your reasons.
Question 2: Draw several parallelograms using the grid points on the graph paper as vertices, and explain your drawing method and the rationale.
Are each set of opposite sides equal? Why?
What shape is such a quadrilateral?
In-class testing
1.The distance between parallel lines refers to ( )
A． A perpendicular segment from a point on a straight line to another straight line
B. The length of a perpendicular segment from a point on a straight line to another straight line
C. The length of a perpendicular line from a point on a straight line to another straight line
D. The length of a line segment from a point on a straight line to a point on another straight line
2. The distance between the intersection point of two parallel lines a and b and the bisectors of the same interior angles intercepted by a third straight line c and the straight line c is 2cm, then the distance between a and b is ( )
A.3cm B.4cm C.5cm D.6cm
Class summary
1. If two straight lines are parallel to each other, and the distance from any point on one straight line to the other straight line is equal, this distance is called the distance between parallel lines;
2. Parallel line segments sandwiched between two parallel lines are equal.
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"Determination of Parallelograms" Parallelogram PPT Download (Lesson 2):
"Determination of Parallelograms" Parallelogram PPT download (Lesson 2), 21 pages in total. Learning Objectives Explore and prove the determination theorem that a quadrilateral whose diagonals bisect each other is a parallelogram; use the determination that a quadrilateral whose diagonals bisect each other is a parallelogram..
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"Determination of Parallelograms" Parallelogram PPT Courseware (Lesson 3) Part One Content: Learning Objectives Understand the concept of the median line of a triangle and master the median line theorem of a triangle. (Key Points) Prove the median line of a triangle through exploration and conjecture. Theorem, proceed...