5)
If m<3 = 42 then m<6 = 42 (vertical angles)
6)
If m<BHE = 142, then m<1 = 142 – 90 = 52 because m<CHE = 90
7)
If m<1 = 37 then m<6 = ?
m<1 +m< 7 = m<6 + m< 7 = 90
So
m<1 = m< 6 = 37
