Let thee interior angle in the triangle at the same point as 140 degrees be T
T + 140 = 180 (sum of angles on a straight line)
T = 180 -140
T = 40
Let the interior angle in the triangle at the same point as 90 degrees be S
S + 90 = 180 (sum of angles on a straight line)
S = 180 -90
= 90
P + 40 + 90 = 180 (sum of angles in a triangle)
P + 130 = 180
P = 180 - 130
P = 50
Option C
