Answer:
Explanation:
The rule for a triangle is that if you add the 2 shorter sides, it must be greater than the longest side (can't even be =, must be bigger.
A. 36+48>60 true yes triangle
B 6.2+5.7>9.4 yes triangle
C. 20+20 is not greater than 50 no not at triangle
D. 12+24>32 yes triangle
Vertical angles mean angles across from each other when 2 lines intersect.
So:
B, C, D are vertical angles