如图，在Rt△ABC中，∠C=90°，AB=10cm，D为AB的中点，则CD=______cm．-数学

更多内容推荐

• 阅读理解。 We've all seen them: perfectly toned famous people on late-night television telling us th
• 阅读理解。 It's happened to all of us: we sleeplessly toss (翻转) and turn while the person next door
• 完形填空。 Scientists find that hard-working people live longer than average men and women. Career women
• Readng comprehension. Britain's oldest man made his first visit to London yesterday at the age
• 已知直角三角形中30°角所对的直角边为3cm，则斜边的长为[]A.3cmB.6cmC.8cmD.9cm-八年级数学
• 如图，在直角三角形ABC中，∠ACB=90°，CD⊥AB于点D，则图中其长度能表示点到直线（或线段）的距离的线段有（）条．[]A．1B．3C．5D．6-七年级数学
• 阅读理解。 What will people die of 100 years from now? If you think that is a simple question, you have n
• 如图，△ABC的各顶点均在正方形网格的格点上．则cosB的值为（）A．12B．22C．32D．33-数学
• 把两块含有30°的相同的直角三角尺按如图所示摆放，使点C，B，E在同一直线上，连结CD，若AC=6cm,则△BCD的面积是（）-九年级数学
• 已知：△ABC中，AB=13，AC=5，BC=12，点D是AB的中点，则CD=______．-数学
• 若直角三角形斜边长为6，则这个直角三角形斜边上的中线长为______．-数学
• 阅读理解。 You can make thedifference between this…and thisThis summer, join the International Conservati
• Reading comprehension. You are what you eat and fats are a main food for Asia's fast-food gener
• 图中有8个完全相同的直角三角形，则图中矩形的个数是（）[]A．5B．6C．7D．8-七年级数学
• 阅读理解。 Teeth are important. Strong, healthy teeth help you chew foods that help you grow. They help y
• 如图，在△ABC中，∠ACB=90°，AC=5，高CD=3，则sinA+sinB等于（）A．35B．45C．1D．75-数学
• 阅读理解。 Many cities around the world today are heavily polluted.Careless methods of production and lac
• 阅读理解。 Malaria, the world's most widespread parasitic (寄生虫引起的) disease, kills as many as three m
• 阅读理解。 A small town in southwest Britain is banning (禁止) plastic bags in an attempt to help the envir
• 如图，直线和x轴，y轴的交点分别为B，C，点A的坐标是（-2，0）．(1)试说明△ABC是等腰三角形；(2)动点M从点A出发沿x轴向点B运动，同时动点N从点B出发沿线段BC向点C运动，运动的速-九年级
• 如图，为了确定一条河的宽度AB，可以在点B一侧的岸边选择一点C，使得CB⊥AB，并量得CB=40米，测得∠ACB=45°，那么河的宽度AB是（）A．40米B．402米C．20米D．202米-数学
• 完形填空。 The amount of usable water has always been of great interest in the world.1 springs and stream
• 阅读理解。 Excused from recycling (回收利用) because you live in a high rise with a rubbish chute (垃圾道)? You
• 阅读理解。 Having a large waistline can almost double your risk of dying prematurely (过早地) even if your b
• 如图：矩形ABCD中，AB=2，BC=5，E、P分别在AD、BC上，且DE=BP=1．（1）判断△BEC的形状，并说明理由？（2）判断四边形EFPH是什么特殊四边形？并证明你的判断；（3）求四边形EF
• 阅读理解。 An overweight, middle-aged man lies dead on a trolley, with a woman weeping over his body. The
• 小明在学习三角形知识时，发现如下三个有趣的结论：在Rt△ABC中，∠A=90°，BD平分∠ABC，M为直线AC上一点，ME?BC，垂足为E，∠AME的平分线交直线AB于点F．（1）M为边AC上一点，则
• 如图所示，在四边形ABCD中，AD∥BC，BC＞AD，∠B与∠C互余，将AB，CD分别平移到EF和EG的位置，则△EFG为（）三角形，若AD=2cm，BC=8cm，则FG=（）cm．-七年级数学
• 阅读理解。 These days a green building means more than just the color of the paint. Green building can al
• 阅读理解。 Millions of people visit Yosemite National Park every year to see the tall waterfalls and moun
• 阅读理解。 It's not the flashiest car in the world. Not even close. But the 1971 Volkswagen named He
• 如图所示，在△ABC中，CD，BE是两条高，那么图中与∠A相等的角的个数有[]A．1个B．2个C．3个D．4个-六年级数学
• 阅读理解。 Many facts suggest that children are overweight and the situation is getting worse, according
• 阅读理解。 Tragedy at the CircusIn yesterday's circus (马戏团) show, a tiger suddenly attacked its trai
• 阅读理解。 The kitten was rescued, but didn't make it out of surgery in one piece.The veterinarian a
• 阅读理解。 The scene in the Hollywood movie The Day After Tomorrow, where global warming could soon turn
• 阅读理解。 During a state of deep relaxation, several physiological changes take place in the body: the b
• 如图所示，在△ABC中，∠C=90°，∠A=30°，AC=4，AB=8，则△ABC的面积为[]A．8B．10C．12D．8-八年级数学
• 一轮船由西向东航行，在A处测得小岛P的方位是北偏东75°，又航行7海里后，在B处测得小岛P的方位是北偏东60°。若小岛周围3.8海里内有暗礁，问该船一直向东航行有无触礁的危险-八年级数学
• 如下图所示，在△ABC中，，点O是△ABC内的一点，且，求证：-八年级数学
• 将一幅三角尺如图所示叠放在一起，若AB=14cm，则阴影部分的面积是()-八年级数学
• 如图，在△ABC中，∠ACB=90°，CD是AB边上的高，∠A=60°，那么∠BCD度数为[]A．30°B．60°C．90°D．条件不足，无法计算-七年级数学
• 阅读理解。 The famous American gorilla (大猩猩) expert Diane Fossey had a completely new way to study gorill
• 下列各组线段中，能构成直角三角形的是[]A．2，3，4B．3，4，6C．5，12，13D．4，6，7-八年级数学
• 如图，某海监船向正西方向航行，在A处望见一艘正在作业渔船D在南偏西45°方向，海监船航行到B处时望见渔船D在南偏东45°方向，又航行了半小时到达C处，望见渔船D在南偏东60°方-九年级数学
• 阅读理解。 Early people had very little effect on the environment. They lived in eaves in very small 
• 阅读理解。 Residents of Golestan Province in northern Iran have one of the highest rates of esophageal ca
• 完形填空。 The tiny snow leopard cub (雪豹仔) looked across the mountainside for its mother, waiting for her
• 阅读理解。 The African elephant, the largest land animal remaining on earth, is of great importance to Af
• 如图，△ABC中，CD⊥AB于点D，一定能确定△ABC为直角三角形的条件的个数是①∠1＝∠A，②，③∠B+∠2=90°，④BC：AC：AB=3：4：5，⑤AC×BD=AC×CD[]A．1B．2C．3D