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如图,△ABC和△BDE都是等边三角形,如果∠DBC=40°,那么∠EBA的大小为 .
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教案备课库《初二年级数学十一假期作业1》真题及答案
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△ABC中①若AB=BC=CA则△ABC是等边三角形②一个底角为60°的等腰三角形是等边三角形③顶
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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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已知在△ABC中∠
=60°,如要判定△ABC是等边三角形, 还需添加一个条件.现有下面三种说法: ①如果添加条件“AB=AC”,那么△ABC是等边三角形; ②如果添加条件“∠
=∠
”,那么△ABC是等边三角形; ③如果添加条件“边AB,BC上的高相等”,那么△ABC是等边三角形. 其中正确的说法有 A.3个 B.2个C.1个
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△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
如图点E.在AD上△ABC和△BDE都是等边三角形.猜想BDCDAD三条线段之间的关系并说明理由.
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
已知如图△BCE△ACD分别是以BEAD为斜边的直角三角形且BE=AD△CDE是等边三角形.求证△A
如图点E.在AD上△ABC和△BDE都是等边三角形.猜想BDCDAD三条线段之间的关系并说明理由.
1如图1△ABC和△CDE都是等边三角形且B.C.D.三点共线联结ADBE相交于点P.求证BE=AD
下列推理中错误的是
∵∠A=∠B=∠C,∴△ABC是等边三角形
∵AB=AC,∠B=∠C,∴△ABC是等边三角形
∵∠A=∠B=60°,∴△ABC是等边三角形
∵AB=AC,∠B=60°,∴△ABC是等边三角形
如图在线段AE同侧作两个等边三角形△ABC和△CDE∠ACE<120°点P与点M分别是线段BE和AD
钝角三角形
直角三角形
等边三角形
非等腰三角形
如图△ABC是等边三角形∠1=∠2=∠3问△DEF是否是等边三角形说明理由.
下列推理中错误的是
∵∠A.=∠
=∠
,∴△ABC是等边三角形 B.∵AB=AC,且∠B.=∠C.,∴△ABC是等边三角形 C.∵∠A.=60°,∠B.=60°,∴△ABC是等边三角形
∵AB=AC,∠B.=60°,∴△ABC是等边三角形
等边三角形ABCP为等边三角形ABC所在平面上一点△PAB.△PCB与△PAC都是等腰三角形这样的点
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下列推理错误的是
在△ABC中,∵∠A=∠B=∠C,∴△ABC为等边三角形
在△ABC中,∵AB=AC,且∠B=∠C,∴△ABC为等边三角形
在△ABC中,∵∠A=60°,∠B=60°,∴△ABC为等边三角形
在△ABC中,∵AB=AC,∠B=60°,∴△ABC为等边三角形
△ABC是等边三角形且AD=BE=CF那么△DEF是等边三角形吗
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
已知命题有的三角形是等边三角形则
:有的三角形不是等边三角形
:有的三角形是不等边三角形
:所有的三角形都是等边三角形
:所有的三角形都不是等边三角形
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