共50条信息
如图,有一条直的宽纸带,按图折叠,则\(∠α\)的度数等于( )
如图,将矩形\(ABCD\)沿\(CE\)向上折叠,使点\(B\)落在\(AD\)边上的点\(F\)处\(.\)若\(AE=\)\( \dfrac{3}{8}\)\(CD\),则\(EF\)与\(CF\)的比值是________.
如图,\(\vartriangle ABE\)和\(\vartriangle ACD\)是\(\vartriangle ABC\)分别沿\(AB\)、\(AC\)边翻折\(180{}^\circ \)形成的,若\(\angle BAC=150{}^\circ \),则\(\angle \theta {=}\)_____
将\(\Delta ABC\)的纸片按如图所示的方式折叠,使点\(B\)落在边\(AC\)上,记为点\({B}{{'}}\),折叠痕为\(EF\),已知\(AB=AC=8\),\(BC=10\),若以点\({B}{{'}}\)、 \(F\)、 \(C\)为顶点的三角形与\(\Delta ABC\)相似,那么\(BF\)的长度是 .
如图,在\(Rt\Delta ABC\)中,\(∠C=90^{\circ}\),\(∠B=30^{\circ}\),\(BC=3\)点\(D\)是\(BC\)边上一动点\((\)不与点\(B\)、\(C\)重合\()\),过点\(D\)作\(DE⊥BC\)交\(AB\)边于点\(E\),将\(∠B\)沿直线\(DE\)翻折,点\(B\)落在射线\(BC\)上的点\(F\)处,当\(\triangle AEF\)为直角三角形时,\(BD\)的长为________
已知:如图,长方形纸片\(ABCD \)沿\(EF \)折叠后,点\(D\)、\(C\)分别落在\(M\)、\(N\)的位置,
\((1)\)求证:\(∠GEF=∠GFE \);
\((2)\)求证:\(∠AEG=∠GFN \);
\((3)\)若\(∠BGM=80^{\circ} \),求\(∠EFC \)的度数.
如图,在\(\triangle ABC\)中,\(\angle ACB=90{}^\circ \),\(AB=5\),\(BC=3\),\(P\)是\(AB\)上一个动点\((\)与点\(B\)不重合\()\),将\(\triangle BCP\)沿\(CP\)所在直线翻折得到\(\triangle B’CP\),连结\(AB{{{'}}}\),则\(AB{{{'}}}\)长度的最小值是____________________.
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