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Category | Format | Size |
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Beijing Normal University Ninth Grade First Volume Mathematics | pptx | 6 MB |
Description
"Properties and Judgment of Rectangles" Special Parallelogram PPT Courseware 4
Warm up before class
1. The four interior angles of the rectangle are ______.
2. The diagonals of the rectangle are ______ and __________.
3. A rectangle is a _______ symmetrical figure.
4. In a right triangle, the right side opposite to the ______ angle is equal to the _______ of the hypotenuse.
5. In a right triangle, ______ on the hypotenuse is equal to ______ on the hypotenuse.
Are the following statements about rectangles correct?
(1) A quadrilateral with one right angle is a rectangle; ( )
(2) A quadrilateral with four equal angles is a rectangle; ( )
(3) A quadrilateral with four right angles is a rectangle. ( )
(4) A quadrilateral with equal diagonals is a rectangle; ( )
(5) A quadrilateral whose diagonals bisect each other and are equal is a rectangle ( )
(6) A quadrilateral with two sets of opposite sides parallel and equal diagonals is a rectangle. ( )
expand:
(1) Is a quadrilateral with equal diagonals a rectangle?
(2) What conditions need to be added to make a quadrilateral with equal diagonals a rectangle?
induction:
A quadrilateral with equal diagonals that bisect each other is a rectangle
∵ AC=BD and OA=OC OB=OD
∴ Quadrilateral ABCD is a rectangle
Now you can help your carpenter friends to detect whether the window frame you made is rectangular. What data can you measure? What are the several solutions and what are the basis?
Solution: Measure the lengths of two sets of opposite sides and the measure of an interior angle. If the lengths of the two sets of opposite sides are equal and the interior angle is a right angle, then the window frame meets the specifications.
Solution: Measure the three interior angles. If the three interior angles are all right angles, the window frame meets the specifications.
Solution: Measure the lengths of the four sides and two diagonals of the window frame respectively. If the lengths of the two opposite sides of the window frame and the lengths of the two diagonals are equal, then the window frame meets the specifications.
Keywords: Special parallelogram teaching courseware, Properties and determination of rectangles teaching courseware, Beijing Normal University edition ninth grade mathematics volume 1 PPT courseware, Ninth grade mathematics slide courseware download, Special parallelogram PPT courseware download, Properties and determination of rectangle PPT courseware Download, .ppt format
For more information about the "Properties and Determination of Special Parallelogram Rectangles" PPT courseware, please click on the "Properties and Determination of Special Parallelograms ppt Rectangles" ppt tag.
"Properties and Judgment of Rectangles" Special Parallelogram PPT Courseware 8:
"Properties and Judgment of Rectangles" Special Parallelogram PPT Courseware 8 Review Import 1. As shown in Figure 1, the two diagonals of the rectangle ABCD intersect at point O. It is known that AOD= 120, AB=2.5cm, then DAO=_____, AC=_____cm, S rectangle ABCD=_____. 2. As shown in Figure 2,...
"Properties and Judgment of Rectangles" Special Parallelogram PPT Courseware 7:
"Properties and Judgment of Rectangles" Special Parallelogram PPT Courseware 7 Scenario 1: On a parallelogram movable frame, two rubber bands are used to cover two opposite vertices respectively. When pulling a pair of non-adjacent vertices , what happens to the shape of a parallelogram...
"Properties and Judgment of Rectangles" Special Parallelogram PPT Courseware 6:
"Properties and Judgment of Rectangles" Special Parallelogram PPT Courseware 6 The first link: Create a scenario and introduce a new lesson Question 1: What are the properties of parallelograms? Question 2: Use an active parallelogram teaching aid to demonstrate how to change an interior angle of a parallelogram...
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Update Time: 2024-09-09
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