# Ch. 7 Geometry Terms

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### Chord

A segment inside the circle which has end points on the sides of the circle.

### Hexagon

a polygon with six sides

### 180

Total measure the angles in every triangle.

### Rhombus

A quadrilateral, parallelogram with 4 congruent sides

### Scalene

A triangle with NO sides congruent

### Square

A quadrilateral, parallelogram with 4 congruent sides and 4 right angles

### Supplementary

Angles whose sum is 180

### Straight

An angle that measures exactly 180

### Obtuse

An angle that measures between 90-180

### Nonagon

A polygon with 9 sides

### Line

A series of points that extends indefinitely in both directions

### Right

An angle that measures exactly 90

### Right Triangle

A triangle with1 right angle

### Regular Polygon

A polygon with ALL sides congruent and ALL angles congruent

### Ray

Part of a line that extends indefinitely in ONE direction with ONE end point

### Parallel lines

Lines that NEVER intersect

### Rectangle

A quadrilateral, parallelogram with 4 right angles

### Equilateral

A triangle with 3 congruent sides

### Triangle

A polygon with 3 sides

### Skew lines

Lines that are NOT in the same plane, that are NOT parallel, and do NOT intersect

A segment that connects the center of the circle to any point on the edge of the circle

### Trapezoid

A quadrilateral with exactly ONE pair of parallel sides.

### Diameter

A chord that crosses through the center of the circle

### Complementary

Angles whose sum is 90

### Decagon

A polygon with 10 sides

### Congruent Sides

Sides that are equal

### Congruent Angles

Angles with equal measures

### Acute

An angle that measures between 0-90

### Parallelogram

A quadrilateral with 2 pairs of parallel lines

### Octagon

A polygon with 8 sides

### Semicircle

An arc that is exactly half of the circumference; use the diameter as a side

### Acute Triangle

has 3 Acute angles

### Segment

Part of a line with 2 endpoints

### Vertical

Angles that are across from each other; they share a vertex only

### Circle

A series of points equidistant from a given point, the center; NOT A POLYGON

### Heptagon

A polygon with 7 sides

### Obtuse Triangle

A triangle with 1 obtuse angle

### Pentagon

A polygon with 5 sides

### Vertex

The intersection of two segments or rays

### Plane

A flat surface that extends indefinitely in all directions

### Point

Indicates a location

Any Polygon with 4 sides

Angles that are next to each other; share a side and vertex

### Intersecting lines

lines or segments that have one point in common; they cross over each other

### Angle

Formed by the intersection of two rays or segments

### Irreagular Polygon

When all sides and angles are NOT congruent

### Arc

Outside portion of a circle between two points

### Isosceles

A triangle with 2 congruent sides

### Central Angle

An angle inside the circle that has the center of the circle as a vertex of the angle

Example: