# Math chapter 1

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1. complementary
2 angles added together to equal 90
2. supplementary
2 angles added to equal 180
right next to each other
4. vertical angles
across and equal to each other
5. linear pairs
2 adjacent angles that form a straight line
6. polygons
• 3 or more sides
• straight lines
• no openings
7. vertex
where sides of a polygon join together
8. equilateral
all sides equal
9. convex
all vertices go out
10. equiangular
all angles are equal
11. regular
all sides are equal and all angles are equal
12. convex
all vertices go out
13. concave
at least one vertex goes in
14. point
• represents location
• no dimension
15. segment
starting and ending point
16. line
contains segment but goes on
17. ray
specific starting point then goes on
18. collinear
points that lie on same line
19. plane
• 2 dimensions
• flat
20. Coplanar
together on same plane
21. opposite rays
lines that share same starting points but go opposite ways
22. intersection
to cross
the sum of the parts equals the whole
24. midpoint
middle point of a line segment
25. midpoint formula
m= x1+x2/2, y1+y2/2
26. distance formula
square root of (x2-x1)2+ (y2-y1)2
27. angles
lines, rays, or segments that intersect
28. vertex
point at which lines rays or segments cross to form the angle