1st box:
m<A + m<B + m<C = 180
2nd box:
substitution property
3rd box:
division property of equality
Hope it helps.
Answer:
2
Step-by-step explanation:
I am not completely sure how to name faces, but I will name them using all four points.
Faces DCBA
Faces BFGC
Faces HGFE
Check the picture below.
Make sure your calculator is in Degree mode.
If n = 5, then 9n = 45
45 - 15 = 30, which is the same thing as 6n