A D C
Name a ray that bisects AC
Name the perpendicular bisector of AC
Name the bisector of <CDB
DFGeometry warm up
D is the midpoint of AC
When you get done with this, please make a new note book
What is symmetry?
There are two types we’re concerned with:
Rotational and Reflective
If a figure has ROTATIONAL symmetry, then you can rotate it about a center and it will match itself (don’t consider 0° or 360°)
If a figure has REFLECTIONAL symmetry, it will reflect across an axis.
What are polygons?
A plane figure formed by 3 or more segments
Has straight sides
Sides intersect at vertices
Only 2 sides intersect at any vertex
It is a closed figure
EQUILATERAL triangle has 3 congruent sides
ISOCELES triangle has at least 2 congruent sides
SCALENE triangle has 0 congruent sides
Center – in a regular polygon, this is the point equidistant from all vertices
Central Angle – An angle whose vertex is the center of the polygonA little more vocab