maths anout form3

a) y-coordinates of A = ( 5 r) / (1 r)
so , length of each sides of the square is (5 r)/(1 r) - 0 = ( 5 r) / (1 r)

b) area of square = 9
length of each sides = 開方9 = 3

by a) 3 = (5 r)/(1 r)
3 3r = 5 r
2r = 2
r = 1

2008-04-09 23:23:36 補充：
不知為何 顯示不到加號 , 數字與r之間的是加號

: a) y-coordinates of A = ( 5 十 r) / (1 十 r)
so , length of each sides of the square is (5 十 r)/(1 十 r) - 0 = ( 5 十 r) / (1十r)

b) area of square = 9
length of each sides = 開方9 = 3

by a) 3 = (5十r)/(1十r)
3十3r = 5十r
2r = 2
r = 1