10. In polygon ABCDE, how many possible
diagonals can be formed
from one vertex
A. 5
B. 4
C. 3
D. 2
11. What is the term that refers to a closed
plane figure determined by
the union of non-collinear
A. angle
C. line
B. plane
D. polygon
12. A polygon where all angles and sides
are congruent is
A. consecutive
C. equiangular
B. equilateral
D. regular