)
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