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如图所示为一横截面为等边三角形的透明柱状介质，一平行于角平分线AD的单色光由AB射入介质，经AB折射后的光线恰好平行于AC，由此可求出介质的折射率为 ，此折射光照射到BC边上时 （选填“能”...
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高三下学期物理《》真题及答案
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在△ABC中①若AB=BC=CA则△ABC为等边三角形②若∠A=∠B=∠C则△ABC为等边三角形③有
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有边长为1的等边三角形卡片若干张使用这些三角形卡片拼出边长分别是234的等边三角形如图所示．根据图
如图所示的正方体用一个平面截去它的一个角则截面不可能是
锐角三角形
等腰三角形
等腰直角三角形
等边三角形
△ABC中①若AB=BC=CA则△ABC是等边三角形②属于轴对称图形且有一个角为60°的三角形是等边
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关于等边三角形下列说法中错误的是
等边三角形中，各边都相等
等边三角形是特殊的等腰三角形
三个角都等于60°的三角形是等边三角形
有一个角为60°的等腰三角形不是等边三角形
如图所示的正方体用一个平面截去它的一个角则截面不可能是
锐角三角形
等腰三角形
等腰直角三角形
等边三角形
如图所示的正方体用一个平面截去它的一个角则截面不可能是
锐角三角形
等腰三角形
等腰直角三角形
等边三角形
有边长为1的等边三角形卡片若干张使用这些三角形卡片拼出边长为234的等边三角形如图所示根据图形推断每
警告标志是警告车辆行人注意危险地点的标志一般为共个
等边三角形、顶角向上；42
等边三角形、顶角向上；40
等边三角形、顶角向下；42
如图分别以等边三角形的每个顶点为圆心以边长为半径在另两个顶点间作一段圆弧三段圆弧围成的曲边三角形称为
不等边三角形构图的式形为一面观造型可用客种容器插制呈多种不等边三角形的轮廓比较活泼多变
外观
剖面
侧面
横截面
.一个等边三角形的边长为2则这个等边三角形的面积为
如图所示的正方体用一个平面截去它的一个角则截面不可能是
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等腰三角形
等腰直角三角形
等边三角形
如图所示的正方体用一个平面截去它的一个角则截面不可能是改编
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如图在数轴上从原点A开始以AB=1为边长画等边三角形记为第一个等边三角形以BC=2为边长画等边三角
如图在数轴上从原点A开始以AB=1为边长画等边三角形记为第一个等边三角形以BC=2为边长画等边三角
公制三角形螺纹牙的断面开状为
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