Geometry presentations

By: Megan Winkle & Snehita Bonthu

Acute Angle

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


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.


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


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

Adjacent angles

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


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


The line that divides something into two equal parts.


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


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


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


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


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.


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 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.


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.


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


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


5th Period