# CH-10 MATH VOCAB.PART 1

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### parallel lines

a line in a plane that never intersect

### convex

diagonals do not have any points outside the polygon

### concave

one or more diagonals have points outside the polgon

### diagonal

a line segment, other than a side, that joins two verticles of a polygon

### regular polygon

a polygon with all sides and all angles congruent

### polygon

a closed plane figure made of the line segments

### alternate exterior angles

a pair of non-adjacent exterior angles on opposite sides of the transversal

### congruent segments

segments that are equal in length

### midpoint

a point that divides a line segment onto two congruent segemts

### straight angle

an angle that measures 180

### obtuse angle

an angle with a measure greater than 90 and less than 180

### acute angle

an angle that measures less that 90

### right angle

an angle that measures 90

### perpendicular lines

lines that intersects to form right angles

### segment bisector

any line ray or segment that intersects a segment at it's midpoint

### perpendicular bisector

a line that is perpendicular to a line segment and divides that segments onto 2 congruent parts

### congruent angles

angles that have the same size and shape

### angle bisector

the ray that divides a given angle onto 2 congruent angles

### complementary angles

2 angles whose measures have a sum of 90

### supplementary angles

2 angles whose measures have the sum of 180

2 angles that are in the same plane

### vertacile angles

2 congruent angles formed by intersecting lines

### transversatle

a line that intersects 2 or more lines at different points

### alternite interior angles

a pair of non-adjacent interior angles on opposite sides of the transversal

Example: