Example Problem Answers

1. Write in if-then form:  Acute angles are less than 90 degrees.

            If an angle is acute then it is less than 90 degrees.

2. Write the converse, inverse, and contrapostive:
        If Ð1 = 95 degrees then it is an obtuse angle.

        converse: If Ð1 is an obtuse angle then it equals 95 degrees.

Name the properties:

3. x = y then y = x              Symmetric
4. 8x+3 = 19 then 8x = 16      Subtraction
5. If a + b = 15 and a = 8 then 8 + b = 15    Substitution   
6. If lm = no and no = pq then lm = pq.    Transitive
7. If 9x = 54 then x = 6      Division
8. If GF = GF        Reflexive
9. If 7x - 4 = 17 then 7x = 21    Addition   
10. If 3(x+2) = 3x + 6        Distributive