b.
6 + pie(3)^2/2 + pie(4)^2/2 - pie(3^2+4^2)/2
=6cm
唔夠訓好累...唔做啦作者: 卓霖 時間: 09-8-10 03:27 AM
標題: 好耐冇做希望help 到你dd ...
cylinder: a)vol. = pie (6)(6)/ 2*(10)= 360piecm(3次方)
b){360pie/2- [(3)(3)(3) ]*6}/ pie(6)(6)
=(180pie- 162pie)/36pie
=1/2
thus,increase了0.5 cm ...1個post answer1 題la , ^^sor ...希望岩, help 到你作者: 卓霖 時間: 09-8-10 03:38 AM
標題: tunnel 果條question
a) (4*10*85)+ pie(10/2)square *85
=3400+ 2125pie or 6676+3400=10676
b) the total surface need to paint ={(4*10)*2+ (4*85)*2+[2pie (5)(85)]/2}/4... 前後2個半圓5知算5算ceiling,(425pie+ 420) /4= 439...if 計前後2個半圓...就加埋2pie(10) 先1次過/4...
ans你篤機la作者: 卓霖 時間: 09-8-10 03:48 AM
標題: no.17 ...可5可以做個fd仔? haa!!
a)angle aob=cod (common) ,so 2pie(27)angleaob /360度 =9pie... then aob =60度
2pie(27+ac)60度 /360度 =15pie ... 27+ac =45,ac=18cm
b)
shaded region ,[pie(45)(45)*60/360]- pie(27)(27)*60/360 =337.5pie- 121.5pie
= 216pie作者: 卓霖 時間: 09-8-10 03:52 AM
標題: too sleepy,sor... = =
