我妈妈是一位十分负责任的好老师。她今年第一次教二年级的数学,经验还不是很足,于是,她就来到我身边,虚心向我请教:“悠悦,你上二年级的时候,老师是怎么教你们认识直角、钝角和锐角的呢?”我感到十分纳闷:妈妈难道不会教课了?对自己能力产生怀疑了?我想了想,笑着说:“老师告诉我们,直角、钝角和锐角是三兄弟,直角站得很直,就像一棵挺拔的松树;锐角是三兄弟中最小的一个,因为他很 My mother is a very responsible teacher. She taught the second grade math this year, the experience is not very full, so, she came to me, humbly asked me to consult: ”Yuyue, when you were sophomore, the teacher is how to teach you to recognize right-angle , Obtuse and acute angle? “I was very puzzled: my mother would not teach? Have doubts about their ability? I thought for a moment, said with a smile: ” The teacher told us that right angle, obtuse angle and acute angle is Three brothers, standing very straight at right angles, like a tall pine; acute angle is the youngest of three brothers, because he is