3.1.3 Proving that Lines are Parallel - Worksheet (continued)
Example 3: 10. Complete the following two-column proof. Given : ∠ 1 ≅ ∠ 2, ∠ 3 ≅ ∠ l Prove : XY || WV X W
11. In the fire escape, m ∠ l = (l7 x + 9)º, m ∠ 2 = (l4 x + 18) ° , and x = 3. Show that the two landings are parallel.
1 2
3
1
Y
V
Proof:
2
Statements
Reasons
1. ∠ 1 ≅ ∠ 2, ∠ 3 ≅ ∠ 1 1. Given 2. ∠ 2 ≅ ∠ 3 2. a.
? ?
3. b.
3. c.
?
146
Made with FlippingBook - professional solution for displaying marketing and sales documents online