- It has no dimensions and is represented by a dot
- Point
- It has 1 dimension and is represents by a line with two arrowheads
- line
- It has 2 dimensions and is represented by a figure that looks like a floor or wall
- plane
- A part of a line that has two endpoints
- segment
- A part of a line that has one end point and extends forever in one direction
- ray
- The points in which two or more geometric figures cross each other
- intersection
- When two segments have the same length or two angles have the same measure they are said to be _____.
- congruent
- The point directly in the middle of a segment
- midpoint
- A figure that cuts a segment or angle in half
- bisector
- An angle whose measure is less than 90 degrees
- acute
- An angle whose measure is exactly 90 degrees
- right
- An angle whose measure is greater than 90 degrees but less than 180 degrees
- obtuse
- An angle whose measure is exactly 180 degrees
- straight
- The point where the two sides of an angle intersect
- Vertex
- When the measure of two angles add up to 90 degrees they are said to be _____.
- complementary
- When the measure of two angles add up to 180 degrees they are said to be _____.
- supplementary
- Two angles that are next to each other and form a straight line are called a _____ pair.
- linear
- Two angles that are across from each other and form an "X" are called _____ angles.
- vertical
- When two lines never intersect, they are said to be _____.
- parallel
- When two lines intersect at a 90 degree angle they are said to be _____.
- perpendicular
- A triangle where no sides are congruent
- scalene
- A triangle where two sides are congruent
- isosceles
- A triangle where all three sides are congruent
- Equilateral
- A segment that connects the midpoints of two sides of a triangle
- midsegment
- a line that goes through a vertex of a triangle and intersects the opposite side at its midpoint
- median
- A line that goes through a vertex of a triangle and intersects the opposite side at a right angle.
- altitude
- The point where all three perpendicular bisectors of a triangle intersect
- circumcenter
- The point where all three angle bisectors of a triangle intersect
- Incenter
- The point where all three medians of a triangle intersect
- centroid
- The point where all three altitudes of a triangle intersect
- orthocenter

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