# Common Core Geometry Terms

### 30 terms by lib_aca_jmo

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### perpendicular lines

Two lines that intersect to form right angles

### intersecting lines

lines that cross at one point

### parallel lines

lines in the same plane that never intersect

### vertex

The common endpoint of an angle

### congruent

Having the same size,length or angle measure

### polygon

a closed 2-dimensional shape formed by three or more straight line segments.

### trapezoid

a quadrilateral with exactly 1 pair of parallel sides

### parallelogram

A quadrilateral opposite sides are congruent and parallel,no right angles

### rectangle

a parallelogram with 4 right angles

### rhombus

a parallelogram with 4 congruent sides,no right angles

### square

a parallelogram with 4 right angles and 4 congruent sides

### isosceles triangle

a triangle with two congruent sides

### obtuse triangle

a triangle with 1 angle greater than 90 degrees

### equilateral triangle

A triangle with 3 congruent sides and 3 congruent angles

### scalene triangle

a triangle with no congruent sides

### right triangle

a triangle with one 90 degree angle

### acute triangle

A triangle with three angles less than 90 degrees.

a polygon with four sides,the general term

### pentagon

a five-sided polygon

### hexagon

a polygon with 6 sides

### octagon

A polygon with 8 sides

### regular polygon

a polygon with all sides and all angles equal or congruent

### faces

flat/plane polygons that make up the sides of a 3-dimensional solid

### vertices

points or corners of a polygon or 3-dimensional solid

### edges

a line segment where two faces meet on a 3-dimensional solid

### net

a 2-dimensional representation of a 3-dimensional solid

### area

The number of square units needed to cover a given polygon

### dimensions

The length, width, and height of an object being measured.

### surface area

The sum of all the areas of all the faces of a 3-dimensional solid.

### volume

The amount of space inside a 3-dimensional solid measured in cubic units.

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