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angle on the bottom left=49 degrees
......bottom right=27 degrees
180 - sum of those two
ahh..this takes knowledge that the total interior angles of a triangle is 180 degrees.
knowing that... we subtract the given values from 180 to get the answer...so...
1980 - 49 - 27 = ?
got it. only checking my work!! thank you
you're welcome ^_^
Use the following to answer questions 16-20
In the following figure, line l is parallel to line m, and the measure of ∠3 is 92°.
16. Find the measure of ∠2.
17. Find the measure of ∠1.
18. Find the measure of ∠8.
19. Find the measure of ∠5.
20. Find the measure of ∠7.
In order to solve your second problem you have to know some properties of parallel lines and lines that intersect them.
1. Interior angles along the same side of the intersecting line are supplementary (ie, they add up to 180 degrees)
2. Exterior angles along the same side of the intersecting line are supplementary
3. Opposite interior angles are congruent
4. Opposite exterior angles are congruent
Using those properties you should be able to answer the questions regarding your diagram.