1. #26 GT Geometry Drill 10/22/13
1. If x 1 y 1 2008 , what is the
value of
1 x 1 y
Put hw on the corner of your desk

3. Find the value of x & y
y

105


85
x


4. Objective
• STW continue to work with
parallel lines and the
angles they form.

5. • Write a two column proof
• Given: Transversal t cuts l & n;
l
• Prove:
t; l // n
t n
l
n
1
2
t

6. Proof
Statement
Reason
1. Transversal t cuts
l & n; l t; l // n
2. m 1 90
1. Given
2. Def of perpendicular
lines
3. Corresponding Angle
postulate
4. Substitution prop. Of =
5. Def of perpendicular
lines
3. m 1 m 2
4. m 2 90
5. t
n

7. Proof
Statement
Reason
1. Transversal t cuts
l & n; l t; l // n
2. m 1 90
1. Given
2. Def of perpendicular
lines
3. Corresponding Angle
postulate
4. Substitution prop. Of =
5. Def of perpendicular
lines
3. m 1 m 2
4. m 2 90
5. t
n