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25 Cards in this Set

  • Front
  • Back

Conjecture

An unproven statement that is based on observations

Inductive reasoning

Looking for patterns and making conjectures

Counterexample

An example that shows a conjecture false

Point

Represented by a small dot

Line

extends in one dimension. It is usually represented by a straight line with two arrow heads to indicate that the line extends without end in two directions

Collinear Points

Points that lie on the same plane

Coplanar points

Points that lie on the same plane

Postulates or Axioms

Rules that are accepted without proof

Distance formula

Congruent Segments

Segments that have the same length

Vertex

Initial Point

angle addition postulate ( angle adb + bdc= adc

Adjacent angles

share a common vetex and side but have no common interior points

midpoint/bisects

The segment into two congruent segments

Segment bisectors

a segment, ray, line or plane that intersects a segment at its midpoint

Midpoint formula

angle bisector

divides an angle into two adjacent angles

Vertical Angles

Their sides form two pairs of opposite rays

Linear pair

Two adjacent angles

Complementary Angles

The sum of their measures is 90 degrees

Supplementary Angles

The sum of the measures is 180 degrees

Perimeter and Area of a square

P=4s


A= s squared

Perimeter and area of a triangle

p= a+b+c


a= 1/2bh

Perimeter and Area ofRectangle

P= 2l+2w


A= lw

Circumference and area of Circle

C= (2)(pi)(r)


A= (pi)(r)(squared)