有D關於坐標既問題啊~~(HELP下啦)
題目係:]
求圖中三角形PQR的面積:
(我POST吳到D圖,所以我打PQR既坐標出尼)
P=(3，1)
Q=(3，-2)
R=(-4，-2)
計三角形既面積...
(解埋題，教我點計)(THX)
坐標問題...(THX)
2007-07-29 10:02 pm
回答 (3)
2007-07-29 10:19 pm
✔ 最佳答案
Ppoint and Q point have the same x-axis,so they are on the same line which is horizontal y-axis.the distance between PandQ is 1-(-2)=3,the h of this triangle is 3.Qpoint and R point have the same y-axis, so they are on the same line which is horizontal x-axis the distance between QaneR is 3-(-2)=5,the base of this triangle is 5.So the are of this triangle is 3*5/2=7.5
2007-07-29 10:14 pm
p,q共一直線(x坐標相同),以直線pq為高
q,r共一直線(y坐標相同),以直線qr為底
底*高/2=面積
q,r共一直線(y坐標相同),以直線qr為底
底*高/2=面積
2007-07-29 10:07 pm
7 x 3 / 2 = 21
收錄日期: 2021-04-20 20:25:10
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070729000051KK02176