McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
7. Vectors
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Exercise 70 Page 690

Look carefully at the given diagram. Can you notice any congruent triangles?

Sets of congruent triangles: 1 , 5 ,6 & 11; 2 ,4 , 7 & 9; and 3 , 8 , 10 & 12

Practice makes perfect
We are given a figure that contains 12 triangles and asked to indicate which of triangles are congruent. Let's look at the given diagram. Notice that we are asked to assume that segments and angles that appear to be congruent are congruent.

Looking at the diagram we can see that it appears that there are 3 sets of congruent triangles, and each of them contains 4 triangles.