"Parallelogram" Quadrilateral PPT Courseware 2

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"Parallelogram" Quadrilateral PPT Courseware 2

Pull, pull, discuss

Please take out the small sticks in your school bag and make a rectangular frame, and then pull a set of opposite corners with your hands to see what shape the frame becomes. Repeat it several times and observe carefully. What can you find?

How many sides does it have? What are the characteristics of the length of the sides?

How many corners does it have? What kind of corners are they?

There are four sides, and the opposite sides are equal.

There are four corners, none of which are right angles.

It is a figure surrounded by four sides, also called a quadrilateral.

Group cooperation: Use the prepared two bamboo strips of the same length and two equally short bamboo strips, and use the two equal lengths as opposite sides to form a rectangle. Then pinch the two opposite corners with your hands and pull them in opposite directions. While pulling, see what shape it forms.

1. Like a rectangle, a parallelogram has four sides and four corners; opposite sides are the same length.

2. The four angles of a rectangle are all right angles, and the parallelogram has two obtuse angles and two acute angles.

Classroom meets standards

1.Judgement questions:

(1) Rectangles, squares and parallelograms are all quadrilaterals. ( )

(2) A quadrilateral with four right angles must be a square. ( )

(3) A quadrilateral has four equal sides. This quadrilateral must be a square. ( )

(4) Quadrilaterals with equal opposite sides are all rectangles. ( )

(5) There is a quadrilateral whose four corners are all right angles. Then, this quadrilateral is either a square or a rectangle. ( )

2.Thinking questions:

There are two rectangles of the same size, both 4 decimeters long and 2 decimeters wide.

(1) How do you put these two rectangles together into a square?

(2) Put these two rectangles together to form a large rectangle. What is its length? How wide is it? How did you fight it?

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Update Time: 2024-11-22

This template belongs to Mathematics courseware Western Normal University Edition Second Grade Mathematics Volume 2 industry PPT template

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