6.5 平行形分类
Section outline
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Classifying Parallelograms
::分类平行图, rhombuses (also called rhombi) and squares are all more specific versions of , also called special parallelograms.
::、 rohombuses (也称为 rhombi) 和 方形都是更具体的版本 , 也称为 特殊平行图 。-
A
quadrilateral
is a
rectangle
if and only if it has four right (congruent)
angles
.
::一个四边形是一个矩形,只要它有四个右(相容)角度,它就是一个矩形。
is a rectangle if and only if .
::ABCD是一个矩形,如果而且只有aA*B*C*D。-
A quadrilateral is a
rhombus
if and only if it has four
congruent
sides.
::一个四边形是暴风雨,只要它有四个一致的两面。
is a rhombus if and only if .
::ABCD是暴风雨,如果而且只有ABBBBBCCDDAD。-
A quadrilateral is a
square
if and only if it has four right angles and four congruent sides. By definition,
a square is a rectangle and a rhombus.
::一个四边形是一个正方形,只要它有四个右角度和四个正方形。 按照定义,一个正方形是一个矩形和一个圆柱形。
is a square if and only if and .
::ABCD是方形的,如果而且只有ABCD和ABBBBCCD是方形的。You can always show that a parallelogram is a rectangle, rhombus, or square by using the definitions of these shapes. There are some additional ways to prove parallelograms are rectangles and rhombuses, shown below:
::您总是可以通过使用这些形状的定义来显示平行图是一个矩形、 矩形或正方形。 还有其他一些方法可以证明平行图是矩形和矩形,如下所示:1. A parallelogram is a rectangle if the diagonals are congruent.
::1. 如果对角线一致,平行图就是矩形。is parallelogram. If , then is also a rectangle.
::ABCD 是平行图。 如果 AC {BD} , 那么 ABCD 也是一个矩形 。2. A parallelogram is a rhombus if the diagonals are perpendicular .
::2. 如果对角线是垂直的,平行图就是一种热柱。is a parallelogram. If , then is also a rhombus.
::ABCD 是一个平行图。 如果 AC {BD} , 那么 ABCD 也是一种暴风雨 。3. A parallelogram is a rhombus if the diagonals bisect each angle.
::3. 如果对角对角对角,平行图就是一个圆柱形。is a parallelogram. If bisects and and bisects and , then is also a rhombus.
::ABCD 是一个平行图。如果 AC 的两部分是“BAD”和“BCDBD ” 的两部分是“ABC”和“ADC ”,那么ABCD 也是一种暴风雪。What if you were given a parallelogram and information about its diagonals? How could you use that information to classify the parallelogram as a rectangle, rhombus, and/or square?
::如果给您一个平行图和关于其对角图的信息呢? 您如何使用该信息将平行图归类为矩形、红外线和(或)正方形?Examples
::实例Example 1
::例1Is a rectangle SOMETIMES, ALWAYS, or NEVER a parallelogram? Explain why.
::一个矩形的时空, 总是, 或从来没有一个平行的图像? 解释原因 。A rectangle has two sets of parallel sides, so it is ALWAYS a parallelogram.
::矩形有两组平行的侧面, 所以是ALWAYS的平行图。Example 2
::例2Is a quadrilateral SOMETIMES, ALWAYS, or NEVER a pentagon ? Explain why.
::一种四边形的时空, 常态的, 或从来没有五边形的吗? 解释一下原因。A quadrilateral has four sides, so it will NEVER be a pentagon with five sides.
::一个四边形有四面形, 所以它永远不会是五面形的五边形。Example 3
::例3Classify the parallelogram type for each of the figures below.
::分类下图中每一图的平行图类型。For the first figure, all sides are congruent and one angle is , so the angles are not congruent. This is a rhombus.
::对于第一个数字来说,所有两边都是一致的, 一个角度是 135 , 所以角度是不一致的。 这是一个暴风雨 。For the second figure, all four angles are congruent but the sides are not. This is a rectangle.
::对于第二个数字,所有四个角度都是一致的,但两面不同。这是一个矩形。Example 4
::例4Is a rhombus SOMETIMES, ALWAYS, or NEVER a square? Explain why.
::暴风雨是有时, 总是,或从来没有一个广场?解释原因。A rhombus has four congruent sides and a square has four congruent sides and angles. Therefore, a rhombus is a square when it has congruent angles. This means a rhombus is SOMETIMES a square.
::圆柱形有四个相似的面, 广场有四个相似的面和角度。 因此, 圆柱形是具有相同角度的方形。 这意味着圆柱形是 COTIMES 方形 。Example 5
::例5List everything you know about the square .
::列出你所知道的关于SQRE的所有信息A square has all the properties of a parallelogram, rectangle and rhombus.
::方形具有平行图、矩形和矩形的所有属性。Properties of a Parallelogram Properties of a Rhombus Properties of a Rectangle -
::"SQ'ER" "SQ"
-
::小声声声声
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::mSER=mSQR=mSE=mRE=90
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::SE - 嗯 - 嗯 -
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::SR E 的
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::
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::SR E 的
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::/SR /RS /SRE /SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SERE/SER /SERE/SER /SERE/SER /SER /SER /SER /SER /SER /SER /SER /SER /SER /SER /SER /SER /SER /SER /SER / 、 或 或 或 或 或 或 或 或 或 或 或 或 或 。
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::SAAAAAAAE SAAAAAAAAAAAAAAAAAAAAASA SAARAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
All the bisected angles are .
::所有的两截角度是45Review
::回顾-
is a rectangle. Find:
-
::RG 中 RG 中 RG -
::英 英 英 英 英 英 英 英 英 -
::AC( AC) AC -
::欧共体 EC 欧共体 -
::máááárac( 毫拉加)
::RACE是一个矩形。 查找: RG AC EC mRAC -
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is a rhombus. Find:
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::马 马 -
::MIMI 军军军军军 -
::达 达 达 达 达 达 达 达 -
::m DIA( m DIA) -
::mMOA
::发现:MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA MA -
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is a square. Find:
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::毫苏克 -
::缩 取 -
::慕 慕 慕 慕 -
::UUEB UUEB UUEB UUUB UUUUB UUUUB UUUUB UUUUUB UUUUUB %UUUUUB
::CUBE是一个正方形。 查找: mZUCE MEYB MEYB MUBY MEUUUB 。 -
For questions 4-15, determine if the quadrilateral is a square, rhombus, rectangle, or none of these.
::对于问题4-15,确定四边形是正方形、正方形、矩形还是非正方形。For questions 16-19 determine if the following are ALWAYS, SOMETIME, or NEVER true. Explain your reasoning.
::对于第16-19个问题,请解释一下你的推理。-
A rectangle is a rhombus.
::矩形是暴风雨 -
A square is a parallelogram.
::方形是一个平行图。 -
A parallelogram is regular.
::平行图是正常的。 -
A square is a rectangle.
::方形是一个矩形。
Review (Answers)
::回顾(答复)Click to see the answer key or go to the Table of Contents and click on the Answer Key under the 'Other Versions' option.
::单击可查看答题键, 或转到目录中, 单击“ 其他版本” 选项下的答题键 。 -
A
quadrilateral
is a
rectangle
if and only if it has four right (congruent)
angles
.