# Geometry Terms Vocabulary Words List from A to Z

Words That Start with Letter W | Words Begin with W | Kids Learning Videos
Words That Start with Letter W | Words Begin with W | Kids Learning Videos

Geometry is a section of mathematics relating to terms like points, lines, and shapes.

## Geometry Vocabulary Words for Kids

So, here is a list of words related to geometry for a complete beginner.

 Term Meaning Point A dot Line Segment It is a line within two points Intersecting Line Segments Line segments which intersect each other Parallel Line Segments Two line segments which never meet each other Perpendicular Line Segment Line segments that form 90 degrees when they intersect Angle The space between two intersecting lines Acute Angle An angle less than 90 but more than 0 degrees Right Angle An angle which exactly measures 90 degrees Obtuse Angle An angle less than 180 but more than 90 degrees Exterior Angle An angle formed on the outer side of two parallel lines when a third line intersects the 2 lines Equilateral Triangle A triangle having its sides and angles equal to each other, (angles = 60 degrees) Isosceles Triangle A triangle having its 2 sides equal to each other Scalene Triangle A triangle with unequal sides and angles Acute Triangle A triangle with all angles measuring lower than 90 degrees Obtuse Triangle A triangle with one angle that measures more than 90 degrees Right Triangle A triangle with an angle that is equal to 90 degrees Circle A round figure with no sides and an equidistant center Radius A line from the equidistant centre of the circle to the surface Square A shape with all equal sides and angles Rectangle A parallelogram having 4 right angles Rhombus A parallelogram with all equal sides Parallelogram A shape with parallel and equal opposite sides Polygon A closed shape bounded by straight edges Quadrilateral A quadrilateral is a polygon with 4 sides Pentagon A shape which has 5 sides Hexagon A shape which has 6 sides Heptagon A shape which has 7 sides Octagon A shape which has 8 sides

Let’s have a look at vocabulary related to Circles, We know that a Circle is a set of all points in a plane at a given distance from a given point in the plane. But there are some terms related to circle like arc, radius, diameter etc. which describe its properties.

Let’s have a look at common words related to circle with their definitions:

 Word Meaning arc a part of a circle congruent arcs arcs that have the same measure AND are in the same or congruent circles central angle angle whose vertex is the center of a circle circle set of points in a plane that are equidistant from a given point chord segment that has both endpoints on the circle concentric circles circles that are coplanar and have the same center congruent circles circles that have congruent radii circle circumscribed about a polygon circle that has contains all the vertices of a polygon circle inscribed in a polygon circle that has sides of a polygon as tangent lines diameter chord that contains the center radius segment whose endpoints are the center of the circle and a point on the circle secant line that intersects a circle in exactly two points semicircle arc with measure exactly 180 degrees tangent line that intersects a circle in exactly one point Minor Arc A minor arc has a measure that is less than 180D . Major Arc A major arc arc has a measure that is greater than 180D Inscribed Angle An angle whose vertex is a point on a circle and whose sides contain chords.