# Geom Ch. 1 - Introducing Geometry

### 49 terms by awise67 Teacher

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### Acute Angle

Angle measuring less than 90 degrees

### Obtuse Angle

Angle measuring more than 90 degrees

### Right Angle

Angle measuring exactly 90 degrees

### parallelogram

a quadrilateral with opposite sides parallell

### Trapezoid

a quadrilateral with exactly one pair of parallel sides

### collinear

lying on the same line

### coplanar

lying on the same plane

### point, line, plane

Building blocks of Geometry, undefined terms

### line segment

two points (the endpoints) all the points between them that are on the line containg them.

### congruent segment

segments that have the same measure

### midpoint

a point ON a line segment that is equally distant from both endpoints.

### ray

all points on a line that lie on one side of a point (the ray's endpoint).

### congruent angles

angles that have the same measure

### angle

formed by two rays that share an endpoint so long as they do not overlap

### angle bisector

a ray that shares the vertex of the angle and divides the angle into two congruent angles.

### degrees

the unit in which angles are measured

### Vertical Angles

formed by intersecting lines and do not share a common/adjacent side.

### Linear Pair of Angles

a pair of angles that share a side and their non-shared side form a straight line (they are supplementary)

### supplementary angles

two angles whose sum is 180 degrees

### complimentary angles

two angles whose sum is 90 degrees

### polygon

closed figure in a plane, formed by connecting line segmenst endpoint to endpoint with each segment intersecting exactly two others.

### diagonal

a line segment that connects two NON-consecutive vertices

### congruent polygons

polygons that have exactly the same size and shape.

### equilateral polygon

polygon that has all equal sides

### equiangular polygon

polygon that has all equal angles

### regular polygon

polygon that has all equal angles AND sides

### right triangle

a triangle with exactly one right angle

### actue triangle

a triangle with all angles less than 90 degrees

### obtuse triangle

a triangle with exactly one obtuse angle

### scalene triangle

a triangle with no equal sides

### equilateral triangle

a triangle with all equal sides

### isosceles triangle

a triangle with two OR MORE equal sides

### rhombus

a parallelogram with equal sides

### square

a parallelogram with equal angles and sides. (a regular quadrilateral)

### kite

a quadrilateral that has two pair of distinct, consecutive congruent sides

### circle

set of all points in a PLANE that are a give distance from a given point

### diameter (of a circle)

a line segment containing the center of a circle, with endpoints that lie on the circle

### radius

a segment from the center of a circle to a point on the circle.

### concentric circles

circles that share a center

### congruent circles

circles that have the same radius

### semicircle

an arc of a circle whose endpoints are on the diameter

### minor arc

an arc that is smaller than a semicircle (name with 2 letters)

### major arc

an arc that is larger than a semicircle (name with 3 letters)

### central angle

an angle whose vertex is at the center of a circle

### chord

a segment with both of its endpoints on the circle

### tangent

a line that intersects a circle exactly once

### Point of tangency

point where a tangent line intersects a circle

### measure of an arc

equivalent to the measure of it's central angle

### space

set of all points

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