plz help me to answer the question.If youdo not knoethe answer, plz answer no!Thx!
1.How many axes of symmetry are there in:
(a)a square
(b)a kite
2.Find the distance between each of the following pairs of point:
(a)A (4,8) ,B (2,8)
(b)C (3,-1) ,D (3,5)
3.The distance between the points (a,-2) and (-2,-2) is 7.a=
A. 7 or -7
B. 10 or -6
C. 5 or -9
D.9or -5
math .f1
2007-07-24 8:28 am
回答 (3)
2007-07-24 8:42 am
✔ 最佳答案
1a) 4 正中兩條, 對角線兩條b) 1 中間一條
2a)
A (4,8) ,B (2,8)
distance = 4 - 2 = 2
(b)
C (3,-1) ,D (3,5)
distance = 5 - (-1) = 5 + 1 = 6
3)
a - (-2) = 7 or -2 - a = 7
a + 2 = 7 or -2 - 7 = a
a = 5 or a = -9
答案係 C
2007-07-24 8:59 am
answer:
(1) (a) 2 axes
(b) 2 axes
(2) (a) distance = ((4-2)^2+(8-8)^2)^0.5=2
(b) distance = ((3-3)^2+(-1-5)^2)^0.5=6
(3) 7^2 = (a+2)^2+(-2+2)^2
a+2 = 7 or -7
a = 5 or -9 (C)
(4) I don't know
(1) (a) 2 axes
(b) 2 axes
(2) (a) distance = ((4-2)^2+(8-8)^2)^0.5=2
(b) distance = ((3-3)^2+(-1-5)^2)^0.5=6
(3) 7^2 = (a+2)^2+(-2+2)^2
a+2 = 7 or -7
a = 5 or -9 (C)
(4) I don't know
2007-07-24 8:42 am
1.(a)4 axes of symmetry
(b)1 axis of symmetry
2.(a) 4-2=2 units
(b)5 - (-1)=5+1=6 units
3. C
(b)1 axis of symmetry
2.(a) 4-2=2 units
(b)5 - (-1)=5+1=6 units
3. C
收錄日期: 2021-04-12 20:38:08
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070724000051KK00128