6th Grade Math Textbook, Progress

Use a protractor and a centimeter ruler to measure the sides and angles of

each triangle. Then classify the triangle by its sides and angles.

13. 
    
    
    
    14. 
        
        
        
        15. 
            
            
            
            16. 
                
            
            
            
            
        
        
        
        
    
    
    
    


14. What did you discover about the relationship between
    the angle and side measures of a triangle?

Construct Congruent Triangles

Congruent triangles have exactly the same size

and the same shape.

Given: 
XYZ

Construct 
ABCcongruent to 
XYZ.

Step 1 Step 2 Step 3

Open the compass to Open the compass to Label the point where

measure the length ofXY
. measure the length of the two arcs intersect

Draw a line
and on the XZ
. From point A, as point C. Draw

line, construct AB

XY
. construct an arc. Open AC
andBC
.

the compass to the 
ABC

XYZ

length of YZ. From

point B, construct an arc

that intersects the

other arc.

Draw the triangle indicated. Then construct a triangle congruent to it.

18. equilateral
    DEF 19.obtuse
    JKL 20. right
    PQR

X Y

Z

Suppose the sides of a triangle have each of the given measures.

Classify each triangle.

21. y, y, y 22. a, 1.25a, 1.25a 23. 3 x, 3x, 3x

A

B A B A B

C

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