"Understanding right angles, acute angles and obtuse angles" PPT courseware on understanding angles

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Hebei Education Edition Second Grade Mathematics Volume 1	pptx	6 MB

"Understanding right angles, acute angles and obtuse angles" PPT courseware on understanding angles

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Upload Time: 2024-10-12

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Description

"Understanding right angles, acute angles and obtuse angles" PPT courseware on understanding angles

teaching objectives

1. Understand right angles through teaching activities such as using a triangle plate to recognize angles, finding angles on objects, folding right angles, and drawing right angles; while using the right angles on the triangle plate to determine whether an angle is a right angle, understand acute angles and obtuse angles.

2. Can identify right angles, acute angles and obtuse angles. Able to find right angles on objects and draw angles as required on graph paper.

3. During the activity of understanding angles, understand the size and relationship of right angles, acute angles, and obtuse angles, develop preliminary spatial concepts, and realize that there are rich graphics in life.

Observe a set of triangles.

what have you found?

This angle is called a right angle.

You can use the right angle on a triangle to determine what angle an angle is.

Angle 1 is a right angle.

Angle 2 is smaller than a right angle and is called an acute angle.

Angle 3 is larger than a right angle and is called an obtuse angle.

practice

1. Observe the hour and minute hands on the clock face and answer the questions.

(1) 2 hours, what angle do the hour hand and minute hand form?

(2) At 3 hours, what angle do the hour hand and minute hand form?

(3) At 9:30, what angle do the hour and minute hands form?

2. Use a triangle to compare. What are the angles below?

3. Draw right angles, acute angles, and obtuse angles on graph paper.

4. What angle do the hour and minute hands form? Fill in ( ).

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For more information about the PPT courseware "Angle Recognition, Right Angle, Acute Angle and Obtuse Angle", please click the Angle Recognition ppt, Recognition of Right Angle, Acute Angle and Obtuse Angle ppt tag.

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Update Time: 2024-10-12

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"Understanding right angles, acute angles and obtuse angles" PPT courseware on understanding angles