Exercise 67 Page 343

To identify the Property of Equality being demonstrated by the given equations, we should first identify the format of the equation. In this case, we are given three equations.

m ∠ A = m ∠ B m ∠ B = m ∠ C m ∠ A = m ∠ C This demonstrates the Transitive Property of Equality. l a = b b = c ⇒ a = c