"Isosceles Triangle" Axis Symmetry PPT Courseware 2

Description

"Isosceles Triangle" Axis Symmetry PPT Courseware 2

Understand the isosceles triangle

A triangle with two equal sides is called an isosceles triangle.

In an isosceles triangle, the two equal sides are called the waist, the other side is called the base, the angle between the two waists is called the vertex angle, and the angle between the waist and the base is called the base angle.

Can you discover any properties of an isosceles triangle? Tell us your conjecture.

Property 1: The two base angles of an isosceles triangle are equal. (Abbreviated as "equilateral equal angles")

Property 2: The bisector of the vertex angle of an isosceles triangle, the midline on the base, and the height on the base coincide with each other. (referred to as "three lines in one")

practice

1. One angle of an isosceles triangle is 40 degrees. What are the measures of its other two angles?

2. One angle of an isosceles triangle is 100 degrees. What are the measures of its other two angles?

3. The base length of an isosceles triangle is 7cm. The midline of one waist length divides the perimeter into two parts. The difference is 3cm. What is the waist length of the isosceles triangle?

What did we learn in this lesson?

1. To solve problems related to isosceles triangles, draw the bisector of the vertex angle and the midline of the base. The height of the base is a commonly used auxiliary line;

2. Be proficient in finding the vertex and base angles of an isosceles triangle;

3. Master the application of the three lines of the isosceles triangle.

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For more information about the "Axisymmetric Isosceles Triangle" PPT courseware, please click the Axisymmetric ppt Isosceles Triangle ppt tag.

"Isosceles Triangle" PPT Courseware 6:

"Isosceles Triangle" PPT Courseware 6

The concept of isosceles triangle

A triangle with two equal sides is called an isosceles triangle.

Two equal sides are called waist

The other side is called the bottom side

The angle between the two waists is called the vertex angle

The angle between the waist and the bottom is called the bottom angle...

"Isosceles Triangle" PPT courseware 5:

"Isosceles Triangle" PPT courseware 5 Experimental exploration Draw an isosceles triangle ABC on the paper, fold the paper in half so that its two waists AB and AC coincide, mark the intersection of the fold and the base as D, and then unfold the paper To lay the ground, think about the following questions: Question (1) Isosceles III..

"Isosceles Triangle" PPT courseware 4:

"Isosceles Triangle" PPT Courseware 4 Course Standard Requirements Explore and prove the property theorem of an isosceles triangle: The two base angles of an isosceles triangle are equal; the altitude line, midline and vertex angle bisector on the base coincide (three lines merge into one). Explore and master the determination theorem of isosceles triangles..

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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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