"Understanding Triangles" Triangle PPT (Lesson 1)

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"Understanding Triangles" Triangle PPT (Lesson 1)

Part One: Learning Objectives

1. Develop spatial concepts, reasoning skills and organized expression skills through activities such as observation, operation, imagination, reasoning, and communication.

2. Combining specific examples, understand the relevant concepts, basic elements and symbolic representations of triangles, and classify triangles.

Understanding Triangles PPT, Part 2: Classic Examples

[Example 1] As shown in the figure, there are _____ triangles, namely ____________, among which the three interior angles of △ABD are ____________________;

In △ACD, the opposite side of ∠C is _________, and the opposite angle of CD is _________.?

[Example 2] As shown in the figure, in △ABC, ∠A=60°, ∠B=40°, then ∠C=()

A.100° B.80° C.60° D.40°

[Example 3] In the blank spaces below, fill in "acute angle", "obtuse angle" or "right angle" respectively:

(1) If the measures of the two interior angles of a triangle are 60° and 50° respectively, then the triangle is a ________ triangle;?

(2) If one interior angle of a triangle is equal to the sum of the other two interior angles, then the triangle is a ________ triangle;?

(3) If the sum of the two interior angles of a triangle is 80°, then the triangle is a ________ triangle.

Understanding Triangles PPT, Part 3: Variation Practice

1. As shown in the figure, there are _____ triangles in total; the triangle with AD as the side has __________; ∠C are the opposite angles of the _____, _____, and _____ sides in △AEC, △ADC, and △ABC respectively.?

2. As shown in the picture, the remaining part of a triangular wooden board is measured. ∠A=100°, ∠B=40°. The degree of the other angle ∠C of this triangular wooden board is ()

A.30°

B.40°

C.50°

D.60°

Understanding Triangle PPT, Part 4: Consolidation Training

5. As shown in the figure, there are triangles ()

A.5 B.6

C.7 pieces D.8 pieces

6. In △ABC, ∠A=45°, ∠C=60°, then ∠B=()

A.125° B.100°

C.75° D.50°

7. The ratio of the measures of the three interior angles of a triangle is 2:3:7. This triangle must be ()

A. Right triangle B. Acute triangle

C. Obtuse triangle D. Unable to determine

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For more information about the "Triangles and Understanding Triangles" PPT courseware, please click on the "Triangles PPT and Understanding Triangles" PPT tag.

"Understanding Triangles" Triangle PPT Courseware (Lesson 4):

"Understanding Triangles" Triangle PPT Courseware (Lesson 4) Part One: Answering Questions and Answers 1. How many heights does the triangle have? Can they be obtained by origami? 2. What is the positional relationship between the three straight lines of the triangle? The altitude of an acute triangle..

"Understanding Triangles" Triangle PPT Courseware (Lesson 3):

"Understanding Triangles" Triangle PPT Courseware (Lesson 3) Part One: Textbook Reading Assistance 1. What is the angle bisector of a triangle? What is the difference between it and the angle bisector? The bisector of an interior angle of a triangle intersects its opposite side. The vertex of the angle and the intersection point...

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"Understanding Triangles" Triangle PPT Courseware (Lesson 2) Part One Content: Learning Objectives 1. Understand the relationship between isosceles triangles and equilateral triangles. 2. Master the relationship between the three sides of a triangle and experience its application in life. .. . ... ... Understand the triangle PPT,...

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Update Time: 2024-11-16

This template belongs to Mathematics courseware Beijing Normal University Edition Seventh Grade Mathematics Volume 2 industry PPT template

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