tc ■ 6 2 7
- = 23.274mm2
4
28.274 ,
- = 0.283 cmz
100
28.274 , 7
0.000028274 =-= 2.827 ■ 10"5m2
1000000
y
tc ■ 63 -
- = 21.205mm3
32
21.205
1000
= 0.021 cm3
21.205 0 _
0.000000021205 =-= 2.1205 ■ 10_8m3
1000000000
tc ■ 64 .
- = 63.61mm4
64
63.61
10000
= 0.006 cm4
63.61 .. ,
0.00000000006361 =-= 6.361 ■ 10_11m4
1000000000000
m4= 10004 lm = lOOOmm