在△ABC中，AD是BC边上的中线，G是重心，如果AG=6，那么线段DG的长为[]A.2B.3C.6D.12-九年级数学

更多内容推荐

• 已知点G是△ABC的重心，那么S△BGCS△ABC=______．-数学
• 如果一个三角形的外心在该三角形的外部，那么这个三角形是（）三角形。-九年级数学
• Few Americans remain in one position or one place for a lifetime. They move from town to city to sub
• 三角形的内心到三角形（）的距离相等。-九年级数学
• 如果在△ABC中，AD是中线，G是重心，那么AG：AD的值为（）。-九年级数学
• 如图，等边△ABC中，G是△ABC的重心，直线AG把△ABC分成面积相等的两部分，但是不是过G点的任意一条直线都把△ABC分成面积相等的两部分？用实验或说理的方法，给予探索并得出结论-八年级数学
• 三角形内到三条边的距离相等的点是[]A．三角形的三条角平分线的交点B．三角形的三条高的交点C．三角形的三条中线的交点D．以上答案都不正确-八年级数学
• 下列命题中：（1）经过一点可以作无数个圆；（2）经过两点只能作一个圆；（3）经过三点一定可以作一个圆；（4）三角形有且只有一个外接圆；（5）圆有且只有一个内接三角形；（6）三角形的-九年级数学
• 如图，I是Rt△ABC（∠C=90°）的内心，过I作直线EF∥AB，分别交CA、CB于E、F．已知EI=m，IF=n，则用m、n表示S△ABC=______．-数学
• 已知在直角ABC中，∠C=90°，AC=8㎝，BC=6㎝，则△ABC的外接圆半径长为（）㎝，△ABC的内切圆半径长为（）㎝，△ABC的外心与内心之间的距离为（）㎝。-九年级数学
• In 2006, a large number of new Internet sites became popular around the world. Some of these are for
• 三角形的重心是[]A．三角形条角平分线的交点B．三角形三条中线的交点C．三角形三条边的垂直平分线的交点D．三角形三条高的交点-八年级数学
• 如图△ABC的三条中线AD、BE、CF相交于一点G(G是△ABC的重心).求证：AG=2DG，BG=2EG，CG=2FG.-八年级数学
• 如图，△ABC中，∠A=70°，H为△ABC的内心，则∠BHC=（）。-九年级数学
• Women are friendly. But men are more competitive. Why? Researchers have found it's all down to
• 三角形三边上的垂直平分线相交于一点，这一点在[]A、三角形内B、三角形外C、角形一边上D、三角形内或三角形外或三角形一边上-九年级数学
• 如图，G是△ABC的重心，AG⊥GC，AC=4，则BG的长为（）．-七年级数学
• Several days ago, a Beijing-based IT company fired about 400 people overnight. No one had expected
• The cultures of the East and the West really distinguish each other a lot. This is because the cultu
• Rae and Bruce Hostetler not only work very hard，they also relax just as well.Numerous vacations help
• Travel UnaccompaniedNow many young people are traveling around the world on their own, not because t
• The elderly Chinese man in the small booth (售票口) behind the thick glass shook his head. I didn'
• Willi around 100 students scheduled to be in that 9 am Monday morning lecture, it is no surprise tha
• 一只猫观察到一老鼠洞的全部三个出口，它们不在一条直线上，这只猫应蹲在处（），才能最省力地顾及到三个洞口。-九年级数学
• A newspaper reporter’s job can be very interesting．He meets all types of people and lives quite a bu
• Some people in Manchester, Britain, will soon be paying for goods and services with so-called “smart
• The fact that blind people can see things using other parts of their bodies apart from their eyes ma
• If you want to stand out，there is no alternative but hard work.Once a boy in____clothes full of patc
• Moving to a new neighborhood，town，state，or even country can be a pretty scary experience.All you kno
• Let's say you want to hit the gym more regularly this year. How do you make that happen? Consid
• (Q =" Question;" A = Answer)Situation IQ: If someone sits right next to me in an empty mov
• Local businessmen are increasingly facing competition from online retailers. Larry Pollock, owner of
• 等腰三角形底边上的高与一腰的垂直平分线的交点是[]A.重心B.垂心C.外心D.无法确定-九年级数学
• “Mum, can I invite my classmate Brett over to stay tomorrow night, please? It’s Friday, and we don’t
• 小题1:Why is June 6, 1990 a special day for Mommy?A．Her dream of being a mother came true.B．She found
• From Japan to Indonesia, a certain kind of pop culture is very hot. But it doesn’t come from Hollywo
• Millions of kids in the United States attend some kind of camp each summer. Some go to sleep-away ca
• I grew up with a fat dad—450 pounds at his heaviest.Every week he would try a new diet，and my family
• When you make a mistake，big or small，cherish it as it’s the most precious thing in the world.Most of
• A daughter thought life was unpromising(无前途的) to her and complained to her father about it. She did
• Four out of ten parents in the UK spend between ￡100 and ￡500 on their children’s birthday parties,
• 三角形外接圆的圆心是[]A.三个内角平分线的交点B.三条边的中线的交点C.三条边垂直平分线的交点D.三边的三条高的交点-九年级数学
• 已知点O为△ABC的外心，若∠A=80°，则∠BOC的度数为（）。-九年级数学
• 有下列结论：（1）平分弦的直径垂直于弦（2）圆周角的度数等于圆心角的一半（3）等弧所对的圆周角相等（4）经过三点一定可以作一个圆（5）三角形的外心到三边的距离相等（6）等腰梯形一定-九年级数学
• Is it ever a good idea admitting a teenager to carry a credit card?My kids watch closely as I swipe
• For most city people, the elevator is an unremarkable machine that inspires none of the enthusiasm o
• Hacking our senses to boost learning powerSome schools are pumping music, noises and pleasant smells
• On this Christmas Day I had the wonderful opportunity to see the true spirit of Christmas.My big fam
• Some people can stay up all night and still get work done the next day.I'm not one of them.Afte
• What is Home stay? Literally it is a home for you to stay at when you are not at home. To be specifi