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

what is m 12?

a.
51°

b.
61°

c.
129°

d.
151°

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°)

step-by-step explanation:

left be aligning the decimal points is required to not required see the number of digits to the right