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所谓盲区是指在我们眼前由于某物体挡住了视线而导致看不见的区域,它相当于物体的投影,也相当于物体的影子,近年来在中考中就曾出现过如下有趣的“盲区”问题.例1如图1,小华家(点A处)和公路(L)之间竖着一块35m长且平行公路的巨型广告牌(DE),广告牌挡住了小华的视线,请在图中画出视点A的盲区,并将盲区内的那段公路记为BC,一辆以60km/h匀速行驶的
The so-called blind area refers to the sight in front of us as a result of blocking the line of sight and can not see the area, which is equivalent to the projection of the object, also equivalent to the shadow of the object, in recent years in the examination had appeared the following interesting " Example 1 As shown in Figure 1, a huge billboard (DE) 35m long and parallel to the road between Xiaohuajia (point A) and the road (L) stands in the billboard and blocks the attention of Xiaohua. Please Draw a blind spot of viewpoint A in the picture, and mark the section of the road in the blind area as BC, one with a constant speed of 60km / h