Big Ideas Math Geometry, 2014
BI
Big Ideas Math Geometry, 2014 View details
5. Proving Triangle Congruence by SSS
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Exercise 39 Page 268

Which angle of △ DEF has the same number of markings as ∠ B?

∠ E

Practice makes perfect
Examining the diagram, we see that ∠ B is the angle with three markings. The angle in △ DEF that is congruent to this must also have three markings. We can identify this angle as ∠ E.