优课网
首页
数学
语文
英语
化学
物理
政治
历史
生物
首页
> 已知△ABC的内切圆O与各边相切于D、E、F,那么点O是△DEF的[]A.三条中线交点B.三条高的交点C.三条角平分线交点D.三条边的垂直平分线的交点-九年级数学
已知△ABC的内切圆O与各边相切于D、E、F,那么点O是△DEF的[]A.三条中线交点B.三条高的交点C.三条角平分线交点D.三条边的垂直平分线的交点-九年级数学
题目简介
已知△ABC的内切圆O与各边相切于D、E、F,那么点O是△DEF的[]A.三条中线交点B.三条高的交点C.三条角平分线交点D.三条边的垂直平分线的交点-九年级数学
题目详情
已知△ABC的内切圆O与各边相切于D、E、F,那么点O是△DEF的( )
A.三条中线交点
B.三条高的交点
C.三条角平分线交点
D.三条边的垂直平分线的交点
题型:单选题
难度:偏易
来源:同步题
答案
D
上一篇 :
一个三角形的外心在其内部,则这
下一篇 :
What could be cuter than you
搜索答案
更多内容推荐
Americans plan parties for many reasons. As in other cultures, many Americans attend parties for wed
阅读短文,掌握其大意,然后从36-55题中选出能填入空白处的最佳答案,使短文句意通顺,符合逻辑,并把答案填在在答题卡内。Once there were two men, who lived in th
Some years ago I was offered a writing assignment that would require three months of travel through
Speaking from my past experience, it is very difficult to find good friends that you can trust but o
When our restaurant business failed,we headed north in a camping truck to Texas,hoping to have a “fr
A dentist’s office may not be everyone’s idea of a perfect holiday destination.But a growing number
Most city parks are places where you can escape from big, ugly structures of metal and stone. The Ma
For my daughter's 19th birthday, we bought her tickets to go and see Linkin Park, as they were
阅读下面短文 , 掌握其大意 , 然后从每题所给的 A , B , C , D四个选项中选出最佳答案 .Travelers to new cities are often told to start
I was an extremely verbal child, and growing up with my dad was an experiment in linguistics(语言学). M
When Gretchen Baxter gets home from work as a New York City book editor, she checks her Blackberry a
Do you want to live with a strong sense of peacefulness,happiness,goodness,and selfrespect?The
Interactive Home-security SystemsTarik Celebi, who lives in San Francisco suburb, takes his home-sec
iPhone owners are vainer (虚荣) and spend more on clothes and grooming(仪容) than those who have BlackBe
When I was a child, I often dreamed of the time when I could leave home and escape to the city. We l
Since the first Earth Day in 1970,American have gotten a lot “greenter” toward the environment . “We
In Britain, people have different attitudes to the police. Most people generally ____them and the jo
Having finished her homework,Ma Li wants some music for relaxation(娱乐).As usual,she starts her compu
When first entered, Vanak Restaurant does not look like much of a restaurant, but once the pleasant
More and more people take part in marathons these days – over 30,000 people will run the London Mara
Many people believe the glare from snow causes snow-blindness. Yet, dark glasses or not , they find
A person has to be sixteen to drive, seventeen to see certain movies, and eighteen to vote. People c
A tent can be one of the more costly items on your camping equipment shopping list. It is definitely
Just like a boxer, we , too come face to face with many opponents on the stage of life—problems and
MultitaskingWhat is the first thing you nitice when you walk into a shop? The products displayed (展示
There's something rotten in Rio and the smell is coming from the huge stacks of rubbish pried
Mrs. Green was over seventies, but she still drove her old car like a woman half her age. She loved
Fumbling with the buttons to find a good song while driving has been linked to increased risk of cra
Dogs already guide blind and disabled people and now they are to be trained to help people with deme
Discover the beautiful, silent, white world or Antarctica on the holidays of a life-time.Head South
Former Irish President Mary Robinson was just making a polite conversation with an Ethiopian (埃塞俄比亚的
When I asked my daughter which item she would keep: the phone, the car, the cooker, the computer, th
Starting a new school term is always exciting. It is a chance to see all of your friends again. But
“ Yeah! Auntie is here! “ screamed my husband’s niece and nephew together. “ Let me get the door!” “
To celebrate the end of our exams, my friends and I went to a fast food restaurant. Wehamburgers and
It’s great fun to explore new places—it feels like an adventure,even when you know you’re not the fi
For more than two days in September 1974, the people of Honduras shut their windows, locked their do
Are you a saver or a spender?"A penny saved is a penny earned." This old saying calls atte
On a hot summer day, a soft drink can really take away your thirst. At home, at school, in the park
I am a person who doesn’t like waiting. I don’t like to wait in line, being put on hold when making
Smoggy weather has become common in China. But these days, air pollution levels in the north easter
You might notice something new in the next few years as you watch Disney programs: Starting in 2015,
Many years ago, when I was in high school and working on weekends, I lost my wallet. After adding ga
There has been an outpouring of love for a 23-year-old disabled woman whose dog was killed in front
A school master of Thurso in Caithness, William Munro, wrote in a report in THE TIMES on September 8
They are the sort of friends who are so close that they trust each other with their lives. If one fa
When I started my career in management, I was really green, but I always tried to stay positive on t
When I settled in Chicago,my new city seemed so big and unfriendly. Then I had a problem and had to
Successful athletes today are able to earn enormous salaries and many of them choose to share the we
Many everyday American expressions are based on colors.Red is a hot colour. Americans may say they a
返回顶部
题目简介
已知△ABC的内切圆O与各边相切于D、E、F,那么点O是△DEF的[]A.三条中线交点B.三条高的交点C.三条角平分线交点D.三条边的垂直平分线的交点-九年级数学
题目详情
B.三条高的交点
C.三条角平分线交点
D.三条边的垂直平分线的交点
答案