Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and PR is parallel to the x-axis.The x-and y-coordinates of P,Q,and R are to be integers that satisfy the inequalities -4≤x≤5,6≤y≤16.How many different tr

来源：学生作业帮助网编辑：作业帮时间：2024/05/14 18:47:47

Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and PR is parallel to the x-axis.The x-and y-coordinates of P,Q,and R are to be integers that satisfy the inequalities -4≤x≤5,6≤y≤16.How many different tr
Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and PR is parallel to the x-axis.The x-and y-coordinates of P,Q,and R are to be integers that satisfy the inequalities -4≤x≤5,6≤y≤16.How many different triangles with these properties could be constructed?
(A)110 (B)1100 (C)9900 (D)10000 (E)12100

Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and PR is parallel to the x-axis.The x-and y-coordinates of P,Q,and R are to be integers that satisfy the inequalities -4≤x≤5,6≤y≤16.How many different tr
选择C.将可能的所有点描出来,是一个10*11的矩形.因为高不能为0且PR平行于x轴,p是直角点,因此我们首先定PR边.在同一个y坐标下PR只需从10个点里任取2点就行,共有10*9/2=45种可能（排列与组合中的组合）然后定高,高就是那11点里除PR边所在的那一条线的其它10点里任选,所以有45*10=450种.而PR纵坐标的选择有11种,所以有450*11=4950种.最后P点是再PR里任选一个,所以一共有4950*2=9900种三角形.

楼主可以去尚友GRE留学文库里搜搜答案，那里有很多GRE的资料和课程，祝楼主顺利~

为什么我感觉应该只有90种不同的三角形呢，底边长从1~9有9种可能，高从1~10有10种可能，这样9*10=90种不同的三角形，GRE的数学题一般不会太难，主要考你语言能力的。

Right Angle Triangle 歌词 triangle triangle triangle Right triangle PQR is to be constructed in the xy-plane so that the right angle is at P and PR is parallel to the x-axis.The x-and y-coordinates of P,Q,and R are to be integers that satisfy the inequalities -4≤x≤5,6≤y≤16.How many different tr 英语翻译The legs of right triangle ABC have lengths 3 and 4.What is the perimeter of a right triangle with each side twice the length of its corresponding side in triangle ABC? 英语翻译Left,Right,X,Up,Down,Square,Left,Right Acquire Weapon Set 1 Left,Right,Square,Up,Down,Triangle,Left,Right Acquire Weapon Set 2 Left,Right,Triangle,Up,Down,Circle,Left,Right Acquire Weapon Set 3 Up,Up,Right,Left,Triangle,Circle,Circle,Squa non-right angled triangle trigonometry是什么意思?这是一个和数学有关的词 non-right angled triangle trigonometry是什么意思?这是一个和数学有关的词英语翻译The coordinates of the three points A,B,C on the plane are (-5,-5),(-2,-1) and (-1,-2),respectively,the triangle ABC is ( )A、a right triangle B、an isosceles triangle C、an equilateral triangle D、an obtuse triangle 英语翻译翻译软件跟复制的别发了.这个谁都会.Bizarre Love Triangle Every time I think of you I feel shot right through with a bow of gloom It's no problem of mine But it's a problem I find Living a life that I can't leave behind Ther 一道IMO试题Construct a right-angled triangle whose hypotenuse c is givenif it is known that the median from the right angle equals the geometricmean of the remaining two sides of the triangle right angled triangle 为什么angle后加个dright angle 不就是直角了么,为什么加d啊 triangle是什么意思 _____answer is right.(I) I am miss,right. Neither you ( ) I right --I right?--yes,