π |
3 |
π |
6 |
a |
b |
a |
c |
a |
0 |
a |
b |
c |
b |
c |
s10 |
10 |
s100 |
100 |
s110 |
110 |
π |
3 |
π |
6 |
π |
6 |
π |
3 |
a |
b |
a |
c |
a |
0 |
a |
b |
c |
b |
c |
n(n-1) |
2 |
Sn |
n |
n-1 |
2 |
d |
2 |
d |
2 |
Sn |
n |
s10 |
10 |
s100 |
100 |
s110 |
110 |
A.(1)(2) | B.(3)(4) | C.(2)(3) | D.(1)(4) |
A.棱柱中只能有两个面可以互相平行 |
B.底面是正方形的直四棱柱是正四棱柱 |
C.底面是正六边形的棱台是正六棱台 |
D.底面是正方形的四棱锥是正四棱锥 |
A.(1)(2 | B.(3)(4) | C.(2)(3) | D.(1)(4) |
y |
b |
a |
. |
x |
. |
y |
S |
3 |
2 |
3 |
A.若a⊥α,b∥α,则a⊥b | B.若a⊥α,b⊥β,α∥β,则a∥b |
C.若a∥α,a∥β则α∥β | D.若a⊥α,b∥a,b⊂β,则α⊥β |
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