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Geometry (Angles (Acute - less than 90, obtuse - between 90 and 180, right…
Geometry
Angles
Acute - less than 90
obtuse - between 90 and 180
right - 90
straight 180
revolutionary - 360
reflex - between 180 and 360
Complementary - add up to 90
Supplementary - add up to 180
Lines
Point *
Line <----->
ray *----->
segment ^------^
parallel | |
Intersecting X
Perpendicular |
__
- 90
Parallel lines
corresponding
Alternate
Co interior = 180
Symmetry
Translation - slide
Rotation - turn
Reflection - flip
Shapes
Triangles
Scalene - 3 different sides
Equilateral - 3 equal sides
Right angled - one right angle
Isosceles - 2 equal sides
Acute - 3 less than 90
obtuse - 1 obtuse angle
Polygons
Regular - all equal
#
Irregular - not all equal
Concave - angles stick in
Convex - angles stick out
#
Names
3 - triangle - 180
5 - pentagon
6 - hexagon
7 - heptagon
8 - octagon
9 - nonagon
10 - decagon
11 - Undecagon
12 - dodecagon
13 - tridecagon
14 - tetradecagon
15 - pendedecagon
16 - hexdecagon
17 - heptdecagon
18 - octdecagon
19 - enneadecagon
20 - icosagon
4 - quadrilateral - 360
