Congruent
• having the same size or angle measure.
• The symbol for congruent is So, the symbol, stands for “is congruent to.”
Corresponding Parts
• parts of polygons that are matching and congruent.
____CAC
A B
F
GE
___CBAFG FEG
Need to Know!
**When stating congruent sides, the order that the segments are written in is very important, because it will identify direction.
Quadrilateral
• a FOUR sided polygon.
Name some quadrilaterals?Square
Rectangle
Rhombus/ Diamond
Parallelogram
Trapezoid
Regular Polygon
• a polygon with ALL sides congruent and ALL angles congruent.
Name a regular polygon that is:
a triangle –
a quadrilateral –
Equilateral TriangleSquare
Square• a parallelogram with 4 right
angles and 4 congruent sidesWhat other names can a square have?
quadrilateral
parallelogram
rectangle
rhombus
Can a trapezoid be a rectangle?
NO
Why?
Trapezoid can have only 1 set of parallel sides. Rectangle has 2.
Is a square always a rectangle?
Yes, ALWAYS!
It fits the definition of a rectangle because a square is a parallelogram, and has 4 right angles.
Diagonal
• the segment that connects two corners of a polygon, but does not make a side of the polygon.
• diagonals connect the inside of a polygon
Circle
• the set of points in a plane that are all the same distance from a given point, called the center.
• a circle is named by its center
Radius
• a segment from the center of a circle to a point on the circle.
• The plural form of radius is radii.
Diameter
• a segment that passes through the center of a circle and has both endpoints on the circle.
A chord is always a diameter.
True or False?
FALSE!
not always, a chord IS a diameter, IF, it also passes through the center of the circle
A diameter is always chord.
True or False?
TRUE!
by definition, a diameter has two endpoints on the circle.
A diameter is equal, in length, to two radii.
True or False?
TRUE!
diameter is equal to the radius times 2.
A radius can be a chord.
True or False?
FALSE!
only 1 part of a radius touches the circle, not two endpoints.
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