"Constructing Triangles with Rulers and Compasses" Triangle PPT Courseware 2

Description

"Constructing Triangles with Rulers and Compasses" Triangle PPT Courseware 2

Do it

Can you make a triangle according to the conditions in the book on page 1471?

Cut out the triangles you made and compare them with your partner to see if they are congruent?

Can you give a reason why they are equal?

Two triangles with equal sides and their angles are congruent

Do it

Can you make a triangle according to the conditions in the book on page 148 2?

Cut out the triangles you made and compare them with your partner to see if they are congruent?

Can you give a reason why they are equal?

Given two angles and one side, can you make a triangle?

Two angles and their included sides correspond to two equal triangles that are congruent

summary

What new gains did the students gain today? Can you tell everyone?

Learned how to make triangles using a ruler and compass

Learned how to make a triangle when two sides and their included angles are known

Learned how to make a triangle when two angles and their included sides are known

Learn how to make a triangle with three known sides

Learned how to make a triangle when two angles and one side are known

Expansion exercises

As shown in the figure, in ABC, BC=5 cm, AC=3 cm, AB=3.5 cm, ∠B=36°, ∠C=44°. Please select the appropriate data and draw a triangle congruent with △ABC. (Use three methods to draw a picture, do not write the method, but mark the data used from the triangle drawn)

practice

(1) Make line segment BC = 5 cm

(2) Draw an arc with C as the center and 3 cm as the radius.

(3) Draw an arc with B as the center and 3.5 cm as the radius. The two arcs intersect at point A.

(4) Connect AB and AC, then △ABC is the triangle you want to construct.

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For more information about the PPT courseware "Using a Ruler and Compass to Construct Triangles from a Triangle", please click the Triangle ppt Constructing a Triangle with a Ruler and Compasses ppt tag.

"Constructing Triangles with Rulers and Compasses" Triangle PPT Courseware 3:

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Update Time: 2024-11-23

This template belongs to Mathematics courseware Beijing Normal University seventh grade mathematics volume 2 industry PPT template

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