gre数学考试关于几何的重点试题(三)

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　　21.In the figure above, if ABCD is a parallelogram with A at the origin, what are the coordinates of C?

　　A.(6,5)
　　B.(6,6)
　　C.(7,4)
　　D.(8,5)
! M  f) O8 Y6 h, T& L( @: ?　　E.(8,6)
　　答案：A
9 C% A2 N( e- U3 G, h+ N 　　22.What fraction of a cubic meter is the volume of a cubic block of stone with edge of length 10 centimeters?(1 meter=100centimeters)
9 T4 m8 F! |+ w: `, j　　A.3/10
( z$ U8 ~1 Z9 p+ `; a　　B.1/10
　　C.1/30
0 @$ t# Y6 o' b( _# k0 R　　D.1/100
3 j$ I; }4 g- `! b* ]　　E.1/1000
4 K1 g7 `8 t, I& X  z& `9 I  U　　答案：E
$ U- r; T; S/ Q1 m5 [- L* f7 u3 U 　　23.In the rectangular coordinate system above, for how many of the points that lie inside or on the boundary of the shaded region are both coordinates integers?

　　A.six
. D0 C/ e) v: T: a# [4 g! q　　B.seven
- C5 x# n/ `7 ?" G　　C.eight
( ^/ z0 n) i" D8 n" w; F　　D.nine
, Z  |8 B+ k" S2 c. _　　E.ten

0 w( R# Y+ Y& w　　答案：E

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</p> 　　24. A rectangular tabletop consists of a piece of laminated wood bordered by a thin metal strip along its four edges. The surface area of the tabletop if x square feet, and the total length of the strip before it was attached was x feet. If the tabletop is 3 feet wide, what is its approximate length, in feet?
6 v; R1 }9 Q: _! d) X　　A.12
　　B.10
1 e0 L, V" B8 G+ l' x9 ]' P; p　　C.9
　　D.8
# D1 p% `# |5 |! i* D) W　　E.6
　　答案：E
　　25.In the coordinate plane, points A and B are endpoints of a diameter of a circle with center (-2,1). If the coordinates of A are (-5,5), what are the coordinates of B?
+ W7 i( B, z2 W, p4 y8 M3 ~. T6 y9 [　　A.(0,0)
　　B.(3,-2)
( b; s1 S+ x$ J$ q9 D, H　　C.(3,-1)
　　D.(2,-2)
% P* Y3 s- {! x3 j$ e% H* @4 n& W　　E.(1,-3)
　　答案：E