Question

if m<1=140, what is m<3

Answer 1

m < 1 = 140
m < 2 = 40

m < 2 + 90 + m < 3 = 180..(total of angles in a triangle are 180)
40 + 90 + <3 = 180
130 + <3 = 180
m < 3 = 180 - 130
m < 3 = 50

Answer 2

I assure you the answer is 50!