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The best answer to the second volume of fifth grade mathematics Yanbian University Press
Xiao Ming draws a triangle ABC, and it is found that ∠ A = 30 and ∠ B = 60, so the degree of ∠C is ().

A: 90

1 10

C. 120

D. 130

Answer a

In the rectangular coordinate system, point A is on the X axis, on the right side of the origin, 2 unit lengths away from the origin, so 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 tessellated into a plane pattern ()

A. regular triangle

B. square

C. regular pentagon

D. regular hexagon

Answer c

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