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precision

The level of detail an instrument can measure.

accuracy

The closeness of any given measurement or value to the

perimeter

The distance around a geometric figure.

area

the surface; Length x Width

kite

A quadrilateral with two distinct pairs of equal adjacent sides.

composite figure

a figure made up of two or more figures

Acute Angle

An angle that measures LESS than 90 degrees.

Line

A straight path that goes without end in two directions.

line of symmetry

The line that divides two matching parts. It can be vertical, horizontal, or diagonal.

line symmetry

what a shape has if it can be folded about a line so that its two parts match exactly

Obtuse Angle

An angle that measures MORE than 90 degrees

ray

Part of a line that has one end point and goes in one direction without end.

right angle

An angle that is 90 degrees (It makes a square in the corner).

straight angle

An angle that measures 180 degrees

Parallelogram

p=s+s+b+b

point

an exact location in space

vertex

The point where two sides meet. (Shared end points of the line segments of a polygon.)

Angle

Two rays with the same end point.

acute triangle

A triangle with three acute angles.

obtuse triangle

A triangle with one obtuse angle.

Right Triangle

A triangle with one right angle.

Intersecting lines

Two or more lines that meet at a common point.

parallel

lines in the plane that are the same distance apart

Perpendicular lines

lines in a plane that intersect to form 4 right angles

Trapezoid

P=s1+s2+b1+b2

Rhombus

a parallelogram with four equal sides and equal opposite angles.

Rectangle

A quadrilateral which is a parallelogram with four right angles.

Square

P=s+s+s+s

Scalene Triangle

A triangle with no congruent sides

Isosceles

two sides have the same length

equilateral

all sides have the same length

polygon

a closed figure made by joining line segments where each line segment intersects exactly 2 others

triangle

P=a+b+c

Quadrilateral

A polygon with 4 sides and 4 angles.

line segment

Part of a line with two end points.

perimeter

The distance around a geometric figure.

circumfernce

The distance, also known as the length, around a circle

arc length

a fraction of the circumference

sector

an area enclosed by two radii of a circle and an intercepted arc

composite figures

a figure that can be separated into regions that are basic figures or shapes

Apothem

The perpendicular distance from the center to a side of a regular polygon.

dimensional change

change in the length and/or width

radius

From center to a point on the circle.

diameter

A straight line passing through the centre of a circle to touch both sides of the circumference.

diagonal

A segment in a polygon that connects two nonconsecutive vertices

base of a polygon

the side of a polygon to which the height is perpendicular

height of a polygon

the length of a segment from one vertex of a polygon perpendicular to the base

regular polygons

All equal sides, all equal angles.

irregular polygons

A polygon which has at least two sides with different lengths or two angles with different measures