共50条信息
如图,在正方形\(ABCD\)中,有一个小正方形\(EFGH\),其中顶点\(E\),\(F\),\(G\)分别在\(AB\),\(BC\),\(FD\)上.
\((1)\)求证:\(\triangle EBF\)∽\(\triangle FCD\);
\((2)\)连接\(DH\),如果\(BC=12\),\(BF=3\),求\(\tan ∠HDG\)的值.
如图所示,在四边形\(ABCD\)中,对角线\(AC\)、\(BD\)相交于点\(E\),\(∠DAB=∠CDB=90^{\circ}\),\(∠ABD=45^{\circ}\),\(∠DCA=30^{\circ}\),\(AB=\sqrt{6}.\)求\(AE\)的长和\(\triangle ADE\)的面积.
如图,在平面直角坐标系中,直线\(OA\)过点\((2{,}1)\),则\(\tan\alpha\)的值是\(({ })\)
如图,在\(Rt\triangle ABC\)中,\(∠C=90^{\circ}\),若\(BC=3\),\(AB=5\),则下列结论正确的是( ).
如图,在\(\triangle ABC\)中,\(D\)是\(BC\)边的中点,若\(∠BAD=90^{\circ}\),\(\tan B=\dfrac{2}{3}\),\(AD=2\),则\(\sin ∠DAC=\)________.
已知:如图,\(AB\)是\(⊙\) \(O\)的直径,弦\(AD\)、\(BC\)相交于\(P\)点,那么\(\dfrac{DC}{AB}\)的值为\((\) \()\)
如图,在\(\triangle ABC\)中,\(∠C=150^{\circ}\),\(AC=4\),\(\tan B=\dfrac{{1}}{{8}}\).
\((1)\)求\(BC\)的长;
\((2)\)利用此图形求\(\tan 15^{\circ}\)的值\(.(\)精确到\(0.1.\)参考数据:\(\sqrt{{2}}\approx {1}{.4}\),\(\sqrt{{3}}\approx {1}{.7}\),\(\sqrt{{5}}\approx {2}{.2})\)
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