"Sum and Difference of Line Segments" PPT courseware

Description

"Sum and Difference of Line Segments" PPT courseware

Example 1 Draw a line segment equal to a known line segment

Solution: Given line segment a, draw line segment AB so that AB=a.

Drawing method: (1) Draw ray AC;

(2) Intercept AB=a on ray AC.

So AB=a.

Note: You are not required to write down the drawing method, but you must mark the letters clearly and write a conclusion.

Question 2: Given line segments a and b, draw a line segment AB such that AB=a+b.

Drawing method: ① First draw a straight line l;

② Intercept in sequence on the straight line l

AC = a, CB = b.

So AB=a+b.

Question 3: Given line segments a and b (b>a), draw a line segment AC such that AC=b-a.

Drawing method: ① First use a ruler to draw a straight line l;

②Intercept AD = b on the straight line l;

Intercept DC=a on line segment AD.

So AC=b-a.

Observe and think

Point M divides line segment AB into two line segments AM and BM of ____,

Point M is called the __________ of line segment AB.

If AM= MB =1/2 AB, then point M is the midpoint of line segment AB

Conversely, if point M is the midpoint of line segment AB, then AM=BM=1/2 AB.

Thinking assessment

Multiple choice questions

It is known that there is a point C on the line segment AB, so that AC:CB=2:3,

And AB=20cm, point M is the midpoint of line segment AC, then line segment AM= ( ).

A, 2cm B, 4cm C, 6cm D, 8cm

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For more information about the "Sum and Difference of Line Segments" PPT courseware, please click the "Sum and Difference of Line Segments ppt" tab.

"Sum and Difference of Line Segments" PPT courseware 2:

"Sum and Difference of Line Segments" PPT courseware 2 Learning target knowledge and skills: 1. Understand the sum and difference of two line segments, and make the sum and difference of two line segments; 2. Understand the meaning of the midpoint of a line segment, and be able to use quantities Relationships represent midpoints and corresponding calculations are performed. Process and...

"Sum and Difference of Line Segments" PPT courseware:

"Sum and Difference of Line Segments" PPT Courseware Example 1 Draw a line segment equal to a known line segment Solution: Given line segment a, draw line segment AB so that AB=a. Drawing method: (1) Draw ray AC; (2) On ray AC Intercept AB=a. So AB=a. Note: It is not required to write the drawing method, but it must be...

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Update Time: 2024-07-08

This template belongs to Mathematics courseware Hebei Education Edition Seventh Grade Mathematics Volume 1 industry PPT template

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