)

A: 90

1 10

C. 120

D. 130

Answer a

In the rectangular coordinate system, point A is on the X axis, located on the right side of the origin, and 2 unit lengths away from the origin, then the coordinate of point A is (

)

A.(-2,0)

B.(2,0)

C.(0,2)

D.(0,-2)

Answer b

Only one of the following regular polygons cannot be inlaid into a plane pattern (

)

A. regular triangle

B. square

C. regular pentagon

D. regular hexagon

Answer c