Kathleen rolled a number cube that has sides labeled 1 to 6. What is the probability that she rolled a 2 or a 4? A) 1/6
B) 1/3
C) 1/2
D) 3/4

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given