"Supplementary Angle and Supplementary Angle" Parallel Lines and Intersecting Lines PPT Courseware 4

Description

"Supplementary Angle and Supplementary Angle" Parallel Lines and Intersecting Lines PPT Courseware 4

supplementary angles

Generally speaking, if the sum of two angles is equal to 90° (right angle), the two angles are said to be supplementary angles. That is, each angle is the supplementary angle of another angle.

Please judge:

(1)∠1+∠2=90°, then ∠1 is a supplementary angle. ( )

(2) ∠1 +∠2+ ∠3=90°, then ∠1, ∠2, ∠3 are supplementary angles to each other. ( )

The geometric language is expressed as:

If ∠1+∠2=90°, then ∠1 and ∠2 are complementary angles to each other

(∠1 is the supplementary angle of ∠2/∠2 is the supplementary angle of ∠1)

complementary angles

Generally speaking, if the sum of two angles is equal to 180° (straight angle), the two angles are said to be supplementary angles. That is, one of them is the supplementary angle of the other angle.

The geometric language is expressed as:

If ∠1+∠2=180°, then ∠1 and ∠2 are supplementary angles of each other (∠1 is the supplementary angle of ∠2/∠2 is the supplementary angle of ∠1)

The opposite is also true: if ∠1 and ∠2 are complementary angles, then ∠1+∠2=180°

practice

True or False:

1. If an angle has a supplementary angle, then the angle must be an obtuse angle ( )

Acute angles, right angles, and obtuse angles all have supplementary angles;

2. Two complementary angles cannot be equal. ( )

Two equal angles that are complementary are right angles;

3. An obtuse angle has no supplementary angle, but it must have a supplementary angle ( )

Expand applications:

1. An angle is three times its supplementary angle. What is the degree of this angle?

2. An angle is 20° smaller than its supplementary angle. What is its supplementary angle? 1. one

induction

Properties of supplementary angles: Supplementary angles of identical angles (congruent angles) are equal.

Properties of supplementary angles: Supplementary angles of identical angles (congruent angles) are equal.

Decide whether the following statements are correct

(1) The sum of 30, 70 and 80 is a straight angle, so these three angles are supplementary to each other. ( )

(2) The supplementary angle of an angle must be an acute angle. ( )

(3) The supplementary angle of an angle must be an obtuse angle. ( )

(4) The angle of 90 is a supplementary angle. ( )

(5) Whether two angles are complementary is related to both their size and their position. ( )

Summary

The concepts of supplementary angles and supplementary angles:

(1) Two angles whose sum is 90° are supplementary angles to each other;

(2) Two angles whose sum is 180° are supplementary angles;

Properties of supplementary angles and supplementary angles:

(1) The supplementary angles of same angles (congruent angles) are equal;

(2) The supplementary angles of identical angles (congruent angles) are equal;

Keywords: teaching courseware of parallel lines and intersecting lines, teaching courseware of supplementary angles and supplementary angles, Beijing Normal University edition seventh grade mathematics volume 2 PPT courseware, download of seventh grade mathematics slide courseware, download of parallel lines and intersecting lines PPT courseware, supplementary angles Download PPT courseware on supplementary angles, in .ppt format

For more information about the "Parallel Lines and Intersecting Lines Complementary and Supplementary Angle" PPT courseware, please click on the Parallel Lines and Intersecting Lines ppt Complementary and Supplementary Angle ppt tag.

"Supplementary Angle and Supplementary Angle" Parallel Lines and Intersecting Lines PPT Courseware 3:

"Supplementary Angle and Supplementary Angle" Parallel Lines and Intersecting Lines PPT Courseware 3 Entering Life 1. What are the three interior angles of the triangle you usually use? What is the sum of two of the acute angles? 2. The picture shows a broken right-angled triangle. Can you find the broken corner?

"Supplementary Angle and Supplementary Angle" Parallel Lines and Intersecting Lines PPT Courseware 2:

"Supplementary Angle and Supplementary Angle" Parallel Lines and Intersecting Lines PPT Courseware 2 Practice 1. The supplementary angle of an angle is 4 times its supplementary angle. What is the degree of the supplementary angle of this angle? 2. As shown in the figure, two walls surround an angle AOB, but people cannot enter the wall. How do we measure the size of this angle...

"Supplementary Angle and Supplementary Angle" Parallel Lines and Intersecting Lines PPT Courseware:

"Supplementary Angle and Supplementary Angle" Parallel Lines and Intersecting Lines PPT Courseware As shown in the picture, when playing billiards, choose the appropriate direction to hit the red ball with the white ball. The red ball will go directly into the bag after rebounding. At this time, 1 equals 2. Which angles are supplementary angles? Supplementary angles and supplementary angles are the mutual relationships between two angles..

File Info

Update Time: 2024-11-21

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

Preview