X
28
Z Y
cos Y = ZY / XY
7/29 = ZY / 28
(28 * 7) / 29 = ZY = 196/ 29
XZ = sqrt (28^2 - (196/29)^2) = (168)sqrt (22) / 29
Tan X = ZY / XZ = (196/29) / [ 168 sqrt (22) / 29] = 196 / [168 sqrt (22)] =
7/ [6sqrt (22) ] =
7 sqrt 22 / ( 6 * 22) =
7sqrt (22) / 138
