Lines and its parts
Angles
Triangles
Polygons
Geometry Vocabulary
100

Two lines that are the same distance apart and will never intersect.

Parallel lines

100

A 90 degree angle.

A right angle

100

A triangle with all three sides of equal length.

Equilateral triangle

100

How many sides does a quadrilateral has?

4 sides

100

A two-dimensional geometric shape composed of a sequence of straight line segments connected to form a closed figure.

A polygon

200

Two lines that intersect each other at a 90º angle, forming a right angle.

Perpendicular lines

200

An angle that is less than 90 degrees.

An acute angle.

200

A triangle with two sides of equal length

Isosceles triangle

200

A polygon with five sides and five angles.

A pentagon

200

A line segment that forms part of a shape

Side

300

Two lines that meet at a common point.

Intersecting lines

300

An angle that is greater than 90 degrees.

An obtuse angle.

300

A triangle with one angle greater than 90 degrees.

Obtuse triangle

300

A polygon with six sides and six angles.

Hexagon

300

Is a point where two or more edges of a shape meet.

Vertex

400

This is part of a line that has a beginning and an end.

A line segment

400

This is the number of degrees in a straight angle.

180 degrees

400

All angles in every triangle will add up to this number of degrees

180 degrees

400

This is a quadrilateral shape with two pairs of opposite sides parallel and 4 right angles

A rectangle

400

A quadrilateral in which both pairs of opposite sides are parallel and equal.

A parallelogram

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