"Determination of Congruent Triangles" Congruent Triangles PPT Courseware

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"Determination of Congruent Triangles" Congruent Triangles PPT Courseware

draw a picture

Draw △ABC so that AB=3cm and AC=4cm.

Compare the triangle drawn in this way with the triangle drawn by your deskmate. Do they coincide with each other?

If you add another condition, make ∠A=45°, draw △ABC

Art style:

1. Draw ∠MAN= 45°

2. Intercept AB= 3cm on ray AM

3. Intercept AC=4cm on ray AN

4. Connect BC

Then △ABC is the desired triangle

Cut out the triangles you drew and compare them with the triangles drawn by your deskmate. Do they overlap?

It can be seen from the previous two questions:

Because the corresponding angles of congruent triangles are equal and the corresponding sides are equal, the problem of proving that the line segments or angles belonging to two triangles are equal is often solved by proving that the two triangles are congruent.

Class summary:

1. The conditions for congruence of triangles. Two triangles are congruent if the two sides and their included angles are equal (side-angle-side or SAS)

2. Use a ruler and compass to draw: a triangle with two known sides and their included angles

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"Determination of Congruent Triangles" PPT courseware 5:

"Determination of Congruent Triangles" PPT Courseware 5 Teaching Objectives In the teaching of this lesson, not only should students learn how to identify congruent triangles with sides, angles, and sides, but more importantly, students should master the method of researching problems and initially Understand the mathematical ideas of classification discussion. From...

"Determination of Congruent Triangles" PPT courseware 4:

"Determination of Congruent Triangles" PPT Courseware 4 Write the converse of the following proposition. The corresponding sides of congruent triangles are equal, the corresponding angles are equal, the corresponding sides are equal, and the corresponding angles are equal. Conjecture that each triangle has three sides and three angles , if you want to judge two triangles...

"Determination of Congruent Triangles" PPT courseware 3:

"Determination of Congruent Triangles" PPT Courseware 3 Discussion: In the above, according to the given conditions, two triangles with different shapes are drawn. This shows that when the two sides of the two triangles and the opposite angle of one of the sides are equal, , these two triangles are not necessarily congruent, do you think...

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Update Time: 2024-09-08

This template belongs to Mathematics courseware People's Education Press Eighth Grade Mathematics Volume 1 industry PPT template

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