Geometry Unit 2 Vocabulary starter 1

regular polygon

• a polygon with 3 or more sides

• a triangle, square, rectangle, pentagon, hexagon, or octagon

• a polygon with all equal sides and angles

• a quadrilateral is all equal sides

inscribed

• a polygon with rotational symmetry

• a polygon inside a circle that goes through all its vertices

• a circle inside a polygon

• a polygon inside a circle with the same centers

circumscribed

• a circle and a polygon with the same center

• a circle that passes through the center of a polygon

• a circle inside a polygon

• a circle that goes through all vertices of a polygon

Perpendicular

• lines do not touch

• lines intersect at a 90 degree angle

• lines are 180 degrees

• lines intersect

bisector

• cuts an angle or a line segment in half

• cuts a line segment in half

• doubles a line segment

• two of something

radius

• a line segment connecting two points on a circle

• a line segment connecting two circles

• a line segment that goes from one point on a circle to another point through the center of the circle

• a line segment from a circles center to a point on the circle

ray

• my uncle

• has one endpoint and extends infinitely in one direction

• extends infinitely in two directions

• has two endpoints

compass

• a tool used to measure length

• a tool used to make circles

• a tool used to tell which way is north

• a tool used to make a straight line

rhombus

• a quadrilateral

• a quadrilateral with four right angles

• a quadrilateral with four congruent sides

• a quadrilateral with four congruent sides and four right angles

circle

• the set of all points in a plane the same distance from a center point

• smooth - no edges

• has a center

• the only polygon with one side.