幫我解答這兩題數學問題!!thank you!!
第8,13,14題,
http://hk.myblog.yahoo.com/lai_for_you2
面積和體積(form2)
2007-05-23 4:52 am
回答 (2)
2007-05-23 11:23 pm
✔ 最佳答案
你冇第8題喎...13)))△PRQ面積 = 6 x (√6^2-3^2)÷2
= 6 √27÷2
= 9√3
扇形 PAB面積 = 9π x 60° ÷ 360° [因為3條邊都一樣,所以係等邊三角形,每個角一樣]
= 3/2π
陰影面積 = △PRQ面積 - 3(扇形 PAB面積)
= 9√3 - 3/2π
= 10.87606829
14))) 正六邊形的角 = 180°(6 - 2) ÷ 6
= 120°
弧FB的長 = 2(10)π x 120° ÷ 360°
=20/3π
花形圖案周界 = 20/3π x 5
= 100/3π
=104.7197551
參考: myself
2007-05-23 5:06 am
13.[(3x2)x3.14]x3/8
=18.84x3/8
=7.065
14.(10x2)x3.14
=20x3.14
=62.8
=18.84x3/8
=7.065
14.(10x2)x3.14
=20x3.14
=62.8
參考: my brian
收錄日期: 2021-04-23 21:31:32
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070522000051KK04137