Question

Lines g, h, and l are parallel and m< 2 = 129°.

Answer 1

<12 would be A (51 degrees) because 2 and 10 are corresponding angles and there are 180 degrees on a straight line!
Hope this helps :)

Answer 2

Answer:

option:A  is correct.

Step-by-step explanation:

Since g,h and l are parallel lines and a line intersect these 3 lines making angles 1,2,....12.

By looking at the figure we could say that

∠2=∠6 since they are pair of corresponding angles.

Hence ∠6=129°

similarly ∠6=∠10 as they are also pair of corresponding angles.

Hence ∠10=129°

Now we know that ∠10+∠12=180° .

(since both the angles lie on a straight line)

129°+∠12=180°

∠12=180°-129°

∠12=51°

Hence option A is correct.(i.e. measure of ∠12 is 51°)