Answer:
a,b,c
Step-by-step explanation:
a is across from 100 degree
b is across from 50 degree
c is across from 40 degree
There is no error
He stated with 15 15x and made 10 for each y=15+10
3
15% of 20=0.15 x 20=3
1. Supplementary
2. Complementary
3. Adjacent angles
4. Vertically opposite angles
Hope it helps. Please mark brainliest.