# Geometry presentations

## Acute Angle

A angle less than 90 degrees but more than 0 degrees.

## Diameter

A straight line passing from side to side through the center of a body or figure, esp. Circle or sphere.

## Equilateral triangle

A three-sided regular polygon.

## Isosceles Triangle

A triangle with two equal sides.

## Line

A long, narrow mark or band

## Lin Segment

a part of a line that is bounded by two end points, and contains every point on the line

## Obtuse Angle

An angle between 90 and 180 degrees.

## Parallel lines

Two lines that will never intercede one and another

## Parallelogram

A four-sided plane figure with opposite side that are parallel.

Adjacent angles, are angles that have a common ray coming out of the vertex going between two other rays.

## Altitude

Altitude of a basic geometrical figure is the shortest distance from its vertex (top) to its base (side).

## Bisector

The line that divides something into two equal parts.

## Reflection

Transformation in which the figure is the mirror image of the other.

## Edges

Edges are the intersection of faces in a three-dimensional figure.

## Face

A Face is a flat surface of a three-dimensional figure.

## Intersect

Two lines are said to Intersect when they cross each other or meet, at a single point.

## Net

A pattern that you can cut and fold to make a model of a solid shape.

## Perpendicular Lines

Lines that are at right angles (90°) to each other.

## Ray

A line with a start point but no end point (it goes to infinity).

## Right Angle

An angle which is equal to 90°, one quarter of a full revolution.

## Symmetry

Symmetry is when one shape becomes exactly like another if you flip, slide or turn it.

## Scalene Triangle

A triangle with all sides of different lengths.
No sides are equal and no angles are equal.

## Vertical Angles

Vertical Angles are the angles opposite each other when two lines cross.

## Base

Bottom line of the of a shape or bottom face of a solid object.

## Corresponding Angles

The angles that occupy the same relative position at each intersection where a straight line crosses two others.

## Rotation

A circular movement.
There is a central point that stays fixed and everything else moves around that point in a circle.

## Polygons

Plane shapes (two-dimensional) with 3 or more straight sides.

5th Period

Mrs.Marlow