三角形面積問題，請求大大解答，謝謝！?
回答 (1)
2020-12-13 9:51 pm
✔ 最佳答案
a.OA = 2, OB = 3, ∠AOB = 130°
a△OAB = (1/2)．OA．OB．sin(∠AOB) = 2.2981
b.
轉直角座標
A = (2 cos(20°), 2 sin(20°)) = (1.879385, 0.684040)
B = ( 3 cos(150°), 3 sin(150°)) = (-2.598076,1.5)
∴ AB = √[(1.879385+2.598076)^2+(0.684040-1.5)^2]
= 4.5512
收錄日期: 2021-05-03 20:38:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20201213115857AAcHMXA