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Authoritative PPT Summary
"Comparison of Angles" PPT Courseware 2
teaching objectives:
1. Compare the size of angles based on graphics
2. Understand the concept of sum and difference of angles
3. Master the concept of angle bisectors
1. Superposition method (starting from “shape”)
(1) It is known that ∠ABC and ∠DEF are as shown in the figure:
2. Measurement method (starting from “number”)
The size of angles is determined by their degrees, so to compare the sizes of two angles, you can measure their degrees for comparison.
Definition: Starting from the vertex of an angle, the ray that divides the angle into two equal angles is called the bisector of the angle.
summary:
1. Angle size comparison method (superposition, measurement).
2. The relationship between the sum and difference of angles.
3. Properties of bisectors of angles.
think:
It is known that O is a point on the straight line AB, OE bisects ∠AOC, and OF bisects ∠COB. Find the size of ∠EOF?
Solution: ∵ OE bisects ∠ AOC, OF bisects ∠COB
∴∠EOC=1/2∠AOC,
∠COF=1/2∠COB
∵∠AOB=∠AOC+∠COB=180°
∴∠EOF=∠EOC+∠COF
=1／2∠AOC+1／2∠COB
=1/2（∠AOC+∠COB)
=90°
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"Comparison of Angles" PPT Courseware 3:
"Comparison of Angles" PPT Courseware 3 Learning Objectives: 1. Learn to use the superposition method to compare the sizes of angles. 2. Know the relationship between the sum, difference, times and minutes of angles, and be able to express them in geometric language. 3. Know the bisectors of angles. The definition of , and can be expressed in geometric language. 1. Do you still remember? ..
"Comparison of Angles" PPT courseware:
"Comparison of Angles" PPT courseware learning objectives: 1. Learn to use the superposition method to compare the sizes of angles. 2. Know the relationship between the sum, difference, times and minutes of angles, and be able to express them in geometric language. 3. Know the bisectors of angles Definition, and can express it in geometric language. 1. Do you still remember? ..
"Comparison of Angles" Basic Plane Graphics PPT Courseware 2:
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