Question

7 7 - check whether the lines I and m are
parallel or not
​

Answer 1

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In figure 1]

Line l and line m are parallel because the sum of interior angles is equal to 180°

In figure 2]

Line l and line m are not parallel because the sum of interior angles is greater than 180°

In figure 3]

Line l and line m are parallel because their outside alternate angles are equal i.e. 120°

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Answer 2

Answer:

1) no

2) yes

3) yes

Step-by-step explanation:

123° + x =180 - supplementary angle

x=57°

x≠47

L isn't parallel to m

2) 50+ x=180 -supplementary angle

x=130

they are corresponding angle

L//m

3) 120+x =180

x=60

120+y=180

y=60

i.e.x=y -alternate angle

so, L//M

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