七年级数学从视图到立体图形测试题.doc

4.2画立体图形（2）从视图到立体图形随堂检测1、一个立体图形的三视图是三个圆，则这个图形是（ ）A、圆柱 B、圆锥 C、球 D、圆2、图中是同一个几何体的三种视图，请写出这个几何体的名称：_。俯视图正视图左视图3、如果一个几何体的正视图和左视图都是等腰三角形，而且俯视图是一个圆，那么这个几何体是_。4、俯视图为圆的立体图形可能是_ 。(填一个即可) 5、下图是一些相同的小正方体构成的几何体的三视图，这些相同的小正方体的个数是_。典例分析例：如图，这是一个由小立方体块搭成的几何体的俯视图，小正方形的数字表示在该位置的小立方体块的个数。请你画出它的左视图和正视图。拓展提高主视图左视图1、一个几何体是由若干个相同的正方体组成的，其主视图和左视图如图所示，则这个几何体最多可由多少个这样的正方体组成？（）A、12个B、13个C、14个D、18个2、下列左图表示一个由相同小立方块搭成的几何体的俯视图,小正方形中的数字表示该位置上小立方块的个数,则该几何体的主视图为( ) 3、如图是由几个小正方体块状的积木搭成的几何体俯视图，小正方形中的数字表示该位置的小正方体块的个数。请你画出这个图形的主视图、左视图。5、用小方块搭一个几何体，使得它的正视图和俯视图如图所示，这样的几何体积只有一种吗？它至少需要多少个小立方块？最多需要多少个小立方块？分别画出它们的几何体与左视图，并在左视图的小正方形中标出小立方块的个数。 6、如图，已知一个零件的正视图和俯视图，请描述这个零件的形状，并补画它的左视图。、取一个小立方块作为基本单元（图），将10个基本单元排成一个“长条”（图），再用10个“长条”组成一个长方体（图），最后用10个长方体构成一个正方体（图）。（1）如图所示的长方体由多少个小立方块组成？答： （2）构成如图所示的正方体，需要多少个小立方块？答： （3）用图所示的正方体作为新的基本单元，重复上述过程，得到一个更大的正方体。这个正方体需要多少个小立方块（用科学记数法表示）？答： （4）再用上一步得到的大正方体作为新的基本单元，重复上述过程，构成一个更大的正方体，这个正方体需要多少个小立方块（用科学记数法表示）？答： 体验中考1、(2009年四川成都中考题)如图所示的是某几何体的三视图，则该几何体的形状是（ ）A、长方体 B、三棱柱 C、圆锥 D、正方体2、（2009年黑龙江牡丹江中考题）由一些大小相同的小正方体搭成的几何体的俯视图如图所示，其中正方形中的数字表示该位置上的小正方体的个数，那么该几何体的左视图是（ ）12A、B、C、D、23132左视图4俯视图3、（2009年山东烟台中考题）一个长方体的左视图、俯视图及相关数据如图所示，则其主视图的面积为（ ）A、6B、8C、12D、244、（2009年浙江丽水中考题）如图，是由一些大小相同的小正方体组成的几何体的主视图和俯视图，则组成这个几何体的小正方体最多块数是（ ）A、9 B、10 C、11 D、12 参考答案：随堂检测1、C 2、四棱锥 3、圆锥 4、圆柱等 5、5个课下作业拓展提高1、圆锥 2、B 3、C 4、5、这样的几何体有9种，符合要求的几何体至少要8个小立方块，最多12个小立方块。（如上图）6、上面是一个直四棱柱、下面是个圆锥的组合体它的左视图如下：左视图7、（1）100；（2）1000；（3）；（4）。体验中考1、B 2、B 3、B 4、C in building lawn, lawn built in growing season required after applying fertilizer. Cold season grass dressing time is best in early spring and fall. After the first green, can play a role in facilitating the growth of second in spring, after the weather turned hot, you should stop dressing. Fertilization in autumn on 9, October. Applies fertilizer the time is late spring of warm-season grasses. In a month or 2 months of growing season to be caught up with fertilizer. Increasing the density of foliage, improve resistance to stepping on. Fertilizing should not be late for the last time in mid-September. 3, trimming the lawn is the focus, and is the most intensive work. Trim control lawn height of the tillers, increasing the density of leaves, weeds and lawn neat and beauty. General lawn trimmed at least 4-5 times a year, prune and trim the number of height is related to two factors. Lower the cutting height requirements, pruning more times. Leaves of grass density and coverage also increases with the number of trim and more. It should be noted that in accordance with regular mowing the grass cutting height, when up to 1.5 times the height of the grass, trim twice times the maximum shall not exceed the specified height. 4, weed weed invasion will seriously affect the quality of the lawn, turf lost uniform and neat appearance and purpose weed and grass competition for water, fertilizer, race the Sun, so that objective grass growth decline, so weed is an essential part of lawn maintenance and management. The fundamental methods of weed prevention and removal is the rational management of water and fertilizer, grass growth promotion purposes, increase competitiveness with weeds, and multiple trim, suppress weedsin building lawn, lawn built in growing season required after applying fertilizer. Cold season grass dressing time is best in early spring and fall. After the first green, can play a role in facilitating the growth of second in spring, after the weather turned hot, you should stop dressing. Fertilization in autumn on 9, October. Applies fertilizer the time is late spring of warm-season grasses. In a month or 2 months of growing season to be caught up with fertilizer. Increasing the density of foliage, improve resistance to stepping on. Fertilizing should not be late for the last time in mid-September. 3, trimming the lawn is the focus, and is the most intensive work. Trim control lawn height of the tillers, increasing the density of leaves, weeds and lawn neat and beauty. General lawn trimmed at least 4-5 times a year, prune and trim the number of height is related to two factors. Lower the cutting height requirements, pruning more times. Leaves of grass density and coverage also increases with the number of trim and more. It should be noted that in accordance with regular mowing the grass cutting height, when up to 1.5 times the height of the grass, trim twice times the maximum shall not exceed the specified height. 4, weed weed invasion will seriously affect the quality of the lawn, turf lost uniform and neat appearance and purpose weed and grass competition for water, fertilizer, race the Sun, so that objective grass growth decline, so weed is an essential part of