NOTE:This lesson is divided into three parts!
Definition: A sign of shape is a miniature picture of a geometric figure or another object.
Shape Indicator and Basic Signs of Shape:
A basic sign of shape is represented by the shape indicator followed by one of more letters, by a numeral, or by a dot combination suggestive of the inkprint shape.
When the shape is a regular polygon (a closed figure with equal sides and equal angles), it is represented by the shape indicator followed by a numeral specifying the number of sides in the figure.
When the shape is an irregular polygon (a closed figure with at least two unequal sides and two unequal angles), it is represented by the shape indicator followed by a letter or a combination of letters suggestive of the inkprint shape.
Angle 


Arc 
Concave Upward 


Concave Downward 



Arrow 
RightPointing 
Contracted Form 


Uncontracted Form 



LeftPointing 


DownPointing 


UpPointing 



Circle 


Diamond 


Ellipse 


Hexagon 

Intersecting Lines 


Is Parallel To 


Is Not Parallel To 


Is Perpendicular To 


Is Not Perpendicular To 


Parallelogram 


Pentagon 

Quadrilateral 


Rectangle 


Rhombus 


Square 


Star 


Trapezoid 


Triangle 
Regular (equilateral) 


Inverted 



Signs of Shape With Structural Modification: A shape with structural modification is one in which two or more signs of shape are combined to form a composite sign, such as adjacent angles; or one in which the general print form of a basic shape is changed to show a more specific form, such as a right angle, a right triangle, etc.
A shape with structural modification is represented by the basic symbol followed by the structural shapemodification indicator , by a letter or an uncontracted combination of letters suggestive of the change in the shape, and by the termination indicator
showing the end of the modification.
Angle 
Adjacent Angles 


Alternate Exterior Angles 


Alternate Interior Angles 


Complementary Angles 


Corresponding Angles 


Exterior Angles 


Interior Angles 


Obtuse Angle 


Right Angle 


Straight Angle 


Supplementary Angles 


Vertical Angles 



Triangle 
 Acute 


Isosceles 


Obtuse 


Right 


Scalene 



Go to Signs of Shape, Part 2
