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Level 83

Two-Dimensional Figures


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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