10.4 复合形状面积
章节大纲
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Area of Composite Shapes
::复合形状区域面积Perimeter is the distance around a shape. The perimeter of any figure must have a unit of measurement attached to it. If no specific units are given (feet, inches, centimeters, etc.), write “units.”
::周边是形状周围的距离。 任何图的周边必须有一个测量单位。 如果没有给出具体单位( 脚、 英寸、 厘米等) , 请写“ 单位 ” 。Area is the amount of space inside a figure. If two figures are congruent , they have the same area ( Congruent Areas Postulate ).
::区域是数字内的面积。如果两个数字相容,它们具有相同的区域(相容区域假设)。A composite shape is a shape made up of other shapes. To find the area of such a shape, simply find the area of each part and add them up.
::复合形状是由其他形状组成的形状。要找到这种形状的面积,只需找到每个部分的面积并将其加起来。Area Addition Postulate: If a figure is composed of two or more parts that do not overlap each other, then the area of the figure is the sum of the areas of the parts.
::增加面积假设:如果一个数字由两个或两个以上部分组成,彼此不重叠,则数字的面积是各部分区域的总和。Consider a basic house drawn as a triangle on top of a square . How could you find the area of this composite shape?
::将方形顶部的三角形画成基本房屋。 您如何找到这种复合形状的区域 ?Examples
::实例Example 1
::例1Find the area of the figure below. All angles that look like right angles are right angles.
::查找图的下方区域。 所有看上去像右角的角都是右角 。Divide the figure into a triangle and a rectangle with a small rectangle cut out of the lower right-hand corner.
::将数字分割成三角形和一个矩形,由右下角的小矩形切开。
::A=Atop 三角形+Arectangle- 小三角形A=( 1269)+( 915)-( 1236)A=27+135- 9A=153 单位2Example 2
::例2Divide the shape into two and one triangle. Find the area of the two rectangles and triangle. All angles that look like right angles are right angles.
::将形状分为两个三角形和一个三角形。找到两个矩形和三角形的区域。所有看上去像右角的角都是右角。Rectangle #1:
::矩形 # 1 : 区域= 24( 9+ 12) = 504 单位2Rectangle #2:
::矩形 # 2 : 面积 = 15( 9+ 12) = 315 单位2Triangle:
::三角形:面积=15(9)2=67.5单位2Example 3
::例3Find the area of the entire shape from Example 2 (you will need to subtract the area of the small triangle in the lower right-hand corner).
::从例2中查找整个形状的区域(您需要减去右下角小三角形的区域)。
::总面积=504+315+67.5-15(12)2=796.5单位2Example 4
::例4All angles that look like right angles are right angles.
::所有看似右角度的角都是右角度。-
Divide the shape into two triangles and one rectangle.
::将形状分为两个三角形和一个矩形。
One triangle on the top and one on the right, the rest of the shape is a rectangle.
::上方一个三角形 右侧一个三角形 形状的其余部分是一个矩形-
Find the area of the two triangles and rectangle.
::找到两个三角形和矩形的区域。
The area of the triangle on top is . The area of the triangle on the right is . The area of the rectangle is .
::上方的三角形区域是8(5)2=20 单位2. 右方的三角形区域是5(5)2=12.5 单位2. 矩形区域是375 单位2。-
Find the area of the entire shape.
::查找整个形状的区域 。
The total area is .
::总面积为407.5个单位2。Review
::回顾Use the picture below for questions 1-4. The composite shape is formed of a square within a square.
::问题1-4使用下面的图象。复合形状由方形内的方形组成。-
Find the area of the outer square.
::找到外方方的区域 。 -
Find the area of one grey triangle.
::找到一个灰色三角形的区域 。 -
Find the area of all four grey triangles.
::找到所有四个灰色三角形的区域 。 -
Find the area of the inner square.
::找到内部方形的区域 。
Find the areas of the figures below. You may assume all sides are perpendicular.
::查找下图的区域。 您可以假设所有侧面都是垂直的 。Find the areas of the composite figures.
::查找综合数字的区域。Use the figure to answer the questions.
::用数字回答问题。-
What is the area of the square?
::广场的面积是多少? -
What is the area of the composite figure?
::综合数字的方面是什么?
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 。 -
Divide the shape into two triangles and one rectangle.