A side view of the top of a building is shown in the diagram below. The measure of angle MNT is 72 degrees. The measure of angle QTS is 34 degrees. Line segment SQ is parallel to line segment MN. Find the measure of angle QSR.

yeah i know the problem you need. i am taking it right now. the answer is step 3

~mickey

more information !

secant-secant formula:

(whole secant) x (external part) =           (whole secant) x (external part)

(8+y-2) *8=                                           (y+4+6) *6

(y+6)*8 = (y+10) *6

distribute

8y+48 = 6y +60

subtract 6y from each side

2y +48 = 60

subtract 48 from each side

2y = 12

divide by 2

y = 6

sv =     (y+4+6)

sv   = 6+4+6

sv = 16