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20 15 Tongren senior high school entrance examination mathematics
1.(20 12? Xiaogan) It is known that ∠ α is an acute angle, ∠αand ∠βare complementary, and ∠αand ∠γare complementary, so the value of ∠β-∠γis equal to ().

.45 caliber? B.60? C.90? D. 180

2.(20 12? Zhaoqing) The lengths of the two sides of the isosceles triangle are 4 and 8 respectively, so the circumference of the isosceles triangle is ().

A. 16? B. 18? C.20? D. 16 or 20

3.(20 12? Yiwu) If two sides of a triangle are 3 and 5, and the third side is even, then the third side can be ().

A.2? B.3? C.4? D.8

(20 12? As shown in the figure, in △ABC, the bisector of ∠ABC and ∠ACB intersects with point E, and the intersection point E is MN∨BC intersects with AB in M and AC in N. If BM+CN=9, the length of the line segment MN is ().

A.6? B.7? C.8? D.9

4.(20 10? Taizhou) As shown in the figure, at △ABC, ∠ C = 90, AC=3, and point P is the moving point on the side of BC, then the length of AP cannot be ().

A.2.5? B.3? C.4? D.5

5.(2006? Liuzhou) Cut off a corner of a polygonal piece of paper, leaving a quadrangle, so the original shape of this paper can't be ().

A. hexagon? Pentagon? C. quadrilateral? D. triangle

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