等邊三角形reason ge問題~~~

2007-12-25 12:03 am
如果triangle ABC is an equil. triangle.
angleA = angleB = angleC = 60 degree(property of equil. triangle)

相反,如果我搵到3個角都係60度,
AB = AC = BC (????)係咩reason 呢..?我寫(property of equil. triangle),個阿sir 話我錯...

回答 (4)

2007-12-25 12:09 am
✔ 最佳答案
你係對的,一定對。你寫(property of equil. triangle),中二課程有講。

中一至中三,all reasons,你問阿sir邊個先對,我俾埋解釋,如果佢搵唔到,姐係你對。
角和直線:
adj. ∠s on st. line直線上的鄰角
∠s at a pt.同頂角
vert. opp. ∠s對頂角
corr. ∠s, AB//CD同位角
int. ∠s supp.同旁內角

三角形和多邊形的角:
∠ sum of Δ三角形內角和
ext. ∠ of Δ三角形外角和
∠ sum of polygon多邊形內角和
sum of ext. ∠s of polygon多邊形外角和

特別的三角形:
base ∠s, isos.Δ
sides opp. equal ∠s
property of isos. Δ
property of equil. Δ

全等及相似三角形:
corr. ∠s, ~= Δs
corr. sides, ~= Δs
corr. ∠s, ~ Δs
corr. sides, ~ Δs
3 side prop.
ratio of 2 sides, inc.∠

mid-pt. theorem
intercept theorem
base ∠s, isos.Δ 等腰三角形對角相等
sides opp. equal ∠s 等邊對角相等
property of isos. Δ 等腰三角形特性

corr. ∠s, ~= Δs 全等Δ對應角
corr. sides, ~= Δs 全等Δ對應邊
corr. ∠s, ~ Δs 相似Δ對應角
corr. sides, ~ Δs 相似Δ對應邊
3 side prop. 三邊成比例
ratio of 2 sides, inc.∠ 兩邊成比例及對角相等

mid-pt. theorem 中點定理
intercept theorem 截線定理

1. Angle sum of triangle = ∠sum of Δ Δ內角和
2. Exterior angle of triangle = ext. ∠ of Δ .Δ外角
3. Pythagoras' theorem = Pyth. theorem 畢氏定理
4. Converse of Pythagoras' theorem = Converse of Pyth. theorem 畢氏定理的逆定理
5. Angle sum of polygon = ∠sum of polygon 多邊形內角和
6. Sum of exterior angles of polygon = sum of ext. ∠s of polygon 多邊形外角和
7. Angles at a point = ∠s at a pt. 同頂角
8. Vertically opposite angles = vert. opp. ∠s 對頂角
9. Adjacent angles on a straight line = adj. ∠s on st. line 直線上的鄰角
10. Corresponding angles 同位角
11. Alternate angles 內錯角
12. Interior angles on the same side 同旁內角
13. Corresponding angles = corr. ∠s, AB//CD 同位角相等
14. Alternate angles = alt. ∠s, AB//CD 內錯角相等
15. Interior angles on the same side = int. ∠s, AB//CD 同旁內角互補
16. Base angles of an isosceles triangle = base ∠s, isos. Δ 等腰Δ底角
17. Equiangular 等角對邊相等
18. Nature of isosceles triangle 等腰Δ性質
19. Nature of equilateral triangle 等邊Δ性質
20. Correspomding sides of congruent triangle 全等Δ的對應邊
21. Corresponding angles of congruent triangle 全等Δ的對應角
22. Corresponding sides of simular triangle 相似Δ的對應邊
23. Corresponding angles of simular triangle 相似Δ的對應角
24. Three sides proportional = 3 sides proportional 三邊成比例
25. Ratio of two sides included angles = ratio of 2 sides, inc. ∠兩邊成比例且夾角相等
26. Angle bisector 角平分線
27. Perpendicular bisector 垂直平分線
28. Median 中線
29. Altitude 頂垂線
30. Common sides 公共邊
31. Common angles 公共角
2007-12-25 12:44 am
當然錯, property of equil. triangle 係當你一早已知 (e.g. given)
AB = BC = CA 時,咁你知佢係 equil. triangle, 先可以用
properties of equil. triangle

而家你知道三個角相等,先知道原來三條邊都係相等,就唔算
一早知佢係等邊, 所以唔可以咁用

你呢個情況應該用等角對等邊
(equal angle, equal side)

2007-12-24 16:49:04 補充:
補充返上面位同學仔答案1. 如果亞 sir 搵唔到就叫佢o岩,咁唔係尋求知識既正確態度亞 sir 唔係萬能, 亞 sir 都可以唔識 / 唔記得 / 答錯 的2. 用返你上面既 reasons 的話,其實應該係sides opp. equal ∠s, 而唔係 properties of equilateral triangle
2016-01-13 10:00 am
兩個similar triangle的邊,比例一樣 。e.g.ΔABC~ΔDEF的話,AB/DE=BC/EF,其他邊也是
2015-10-08 11:45 am
(corr.sides,∼Δ)是甚麼意思


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