33
9) In the diagram below, the top of the bridge is parallel to the deck, and the
brace in the middle is vertical, perpendicular to the deck, determine the
size of ∠ 1 and ∠ 2.
10) Identify the pairs of parallel lines in the following diagrams. (Hint: The
lines can be extended).
Answers:
∠
∠
∠
∠
1)
1 = 109°
2 = 62°
3 = 118°
4 = 62°
∠
∠
∠
∠
2)
1 = 112°
2 = 68°
3 = 68°
4 = 112°
∠
3) l
and l
are parallel
4)
1 = 57°
1
3
∠
∠
∠
∠
5)
1 = 54°
2 = 54°
3 = 97°
4 = 83°
∠
∠
∠
6)
1 = 122°
2 = 90°
7)
2 = 127°
∠
∠
∠
∠
∠
8)
1 = 68°
2 = 68°
3 = 68°
4 = 120°
5 = 68°
∠
∠
9)
1 = 57°
2 = 33° 10) l
and l
; l
and l
; l
and l
1
2
3
6
4
5
Math 10 Workplace
Marsh