Geometry Math Test (Tucker)

Collinear points

Points on the same line

Coplanar points

Points on the same plane

Postulate

A rule accepted without proof

Axiom

A rule that is accepted without proof

Segment bisector

A point, ray, line, line segment, or plane that intersects the segment at its midpoint

Midpoint formula

(x₁+x₂)/2, (y₁+y₂)/2

Distance formula

d = √[( x₂ - x₁)² + (y₂ - y₁)²]

Interior of the angle

The region that contains all the points between the sides of the angle

Exterior of the angle

The region that contains all points outside the angle

Measure of an angle

The absolute value of the difference between the real numbers matched with the two rays that form the angle on a protractor

Angle bisector

A ray that divides an angle into two angles that are congruent

Linear pairs

Two adjacent angles are a linear pair when their noncommon sides are opposite rays - supplementary angles

Vertical angles

Two angles are vertical angles when their sides form two pairs of opposite rays

Shape with four sides

Quadrilateral

Shape with five sides

Pentagon

Shape with six sides

Hexagon

Shape with seven sides

Heptagon

Shape with nine sides

Nonagon

Shape with ten sides

Decagon

Shape with twelve sides

Dodecagon

A shape that is 11 and up (besides 12) is called...

A (# of sides) - gon

Convex angle

Convex polygons are polygons where all interior angles are measured less than 180 degrees

Concave angle

Concave polygons are polygons with at least one interior angle that measures greater than 180 degrees