Find all missing angles. show your work.

(I’ll be using the < sign as the angle symbol)

*m<1 = 180 - 129
m<1 = 51

*m<1 + m<2 + 95 = 180
51 + m<2 + 95 = 180
146 + m<2 = 180
m<2 = 180 - 146
m<2 = 34

*m<3 = 95 (opposite by vertex)

*m<3 + m<4 + 47 = 180
95 + m<4 + 47 = 180
142 + m<4 = 180
m<4 = 180 - 142
m<4 = 38

*m<5 = 47 (opposite by vertex)

*m<7 = 180 - 121
m<7 = 59

*m<5 + m<6 + m<7 = 180
47 + m<6 + 59 = 180
m<6 + 106 = 180
m<6 = 180 - 106
m<6 = 74

The student did not distribute properly to get A = P + Prt.

The equation can be fixed by putting a factor of P in the denominator: r = (A - P) / (Pt)

I just took this part of the lesson. Good luck to all!