Exercise 1 Page 287

To identify the Property of Equality being demonstrated by the given equation, we should first identify the operation being performed. If m∠ 1= m∠ 2 and m∠ 2 = m∠ 3, then m∠ 1= m∠ 3.

In this case, we are given three equations. m∠ 1 = m∠ 2 m∠ 2 = m∠ 3 m∠ 1 = m∠ 3 This demonstrates the Transitive Property of Equality. l a = b b = c ⇒ a = c