II) Difference of its side and diagonal is 1 cm ?
I need urgently ... Thanks
I need it urgently...
更新1:
I need construction and steps of construction in geometric form
How to construct a squre when .....?
2013-05-20 8:47 am
I) Sum of its side and diagonal is 6.2 cm?
II) Difference of its side and diagonal is 1 cm ?
I need urgently ... Thanks
I need it urgently...
II) Difference of its side and diagonal is 1 cm ?
I need urgently ... Thanks
I need it urgently...
回答 (2)
2013-05-20 6:56 pm
✔ 最佳答案
s + d = 6.2d – s = 1
2d = 7.2
d = 3.6
draw line segment of 3.6 cm AB
draw perpendicular bisector MON
O is midpoint of AB
draw circle with O as center and OA or OB as radius
The perpendicular bisector of AB cut the circle at M and N
Join AM, MB. BN, NA
AMBN is required square
side of square 2s² = 3.6²
s = 3.6/√2 = 1.8√2
-----
2013-05-20 8:58 am
s^2 + s^2 = c^2
2s^2 = c^2
s + c = 6.2
c = 6.2 - s
2s^2 = (6.2 - s)^2
2s^2 = (6.2 - s)(6.2 - s)
2s^2 = 38.44 - 6.2s - 6.2s + s^2
2s^2 = 38.44 - 12.4s + s^2
s^2 + 12.4s - 38.44 = 0
s = (-12.4 ± √307.52) / 2
ignore negative solution
s = 2.5681240867131893025704700901001 cm
2s^2 = c^2
s + c = 6.2
c = 6.2 - s
2s^2 = (6.2 - s)^2
2s^2 = (6.2 - s)(6.2 - s)
2s^2 = 38.44 - 6.2s - 6.2s + s^2
2s^2 = 38.44 - 12.4s + s^2
s^2 + 12.4s - 38.44 = 0
s = (-12.4 ± √307.52) / 2
ignore negative solution
s = 2.5681240867131893025704700901001 cm
收錄日期: 2021-04-20 20:02:03
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130520004727AAflTA5