- adjacent angles
- share a common vertex and side, but have no common interior points.
- angle bisector
- a ray that divides an angle into two adjacent angles that are congruent.
- collinear points
- points that lie on the same line.
- complementary angles
- sum of their measures is 90 degrees
- congruent angles
- angles that have the same measurement.
- conjecture
- an unproven statement that is based on observations.
- coplaner points
- points that lay on the same plane.
- counterexample
- an example that shows that a conjecture is false.
- distance formula
- root(x2-x2)squared + (y2-y1)squared
- intersect
- have one or more points in common.
- line
- extends in one dimension, usually represented by a straight line with two arrowheads.
- line segment
- line with points on the end.
- linear pair
- two adjacent angles with noncommon sides being opposite rays (equals 180 degrees together)
- midpoint
- point that divides the segment into two congruent segments.
- opposite rays
- rays that have the same point, look like a line with a point on it.
- plane
- extends in two dimensions, usually represented by a shape that looks like a wall or tabletop.
- point
- has no dimension, and is usually represented by a small dot.
- postules
- rules accepted without proof.
- ray
- consists of a line with a point at one end.
- supplementary angles
- sum of their measures is 180 degrees.
- theorems
- rules that are proved.
- vertical angles
- sides form two pairs of opposite rays.
- what is the formula for area of a triangle?
- a= 1/2bh
- what is the formula for the area of a circle?
- a= pi r squared
- what is the formula for the circumference of a circle?
- c= 2 pi r
- which are equal, which are congruent?
- measures are equal, angles are congruent.
