(11·西宁)如图7,将直角三角形的直角顶点放在直尺的一边上,∠1

(11·西宁)如图7,将直角三角形的直角顶点放在直尺的一边上,∠1=30°,∠3=20°,则∠2=_   ▲  

 

答案

50°

解析:略

 

相关题目

在我国一些农耕区,仍存在秸秆焚烧现象,比较好的有秸秆
在我国一些农耕区,仍存在秸秆焚烧现象,比较好的有秸秆直接粉碎还田和利用作物秸秆等农副产品发展农区畜牧业等。回答下面试题。 对秸秆焚烧的
读下图及材料,完成下列问题。     1519年9月20日,麦哲伦
读下图及材料,完成下列问题。     1519年9月20日,麦哲伦的船队从西班牙的圣罗卡出发,踏上了环球航行的征途。1522年9月6日,麦哲伦船队的“维多
一条弦把半径为8的圆分成1∶2的两条弧,则弦长为(    )
一条弦把半径为8的圆分成1∶2的两条弧,则弦长为(    ) A、    B、    C、8    D、16
In 1841, a book was published which astonished the world. It was called“Incide
In 1841, a book was published which astonished the world. It was called“Incidents of Travel in Central America, Chiapas and Yucatan”. The author John Loud Stephens had just returned from a long, d
I like these English songs and they           many times on the radio.
I like these English songs and they           many times on the radio. A.taught             B.have taught      C.are taught      D.have been taught  
在一个生态系统中,A种群有N个个体,B种群有100N个个体,C种
在一个生态系统中,A种群有N个个体,B种群有100N个个体,C种群有1000N个个体,D种群有10000N个个体,则它们的食物链关系是             (  )  
已知数列的前项和为. (Ⅰ)求数列的通项公式;    (Ⅱ
已知数列的前项和为. (Ⅰ)求数列的通项公式;    (Ⅱ)若,求的值.
   You probably know you should say please and thank you at restaurants. You
   You probably know you should say please and thank you at restaurants. You probably know the rules of a library. You know you should respect and be nice to your classmates. But do you have musi

最新题目