Answer:
Rhombus
Step-by-step explanation:
A triangle when rotated around any point by 180° forms a Rhombus.
1st box: 2a (subtract 2a from both sides)
2nd box: 3 (add 3 to both sides)
3rd box: 10 (add 7+3)
4th and 5th box: 2 (divide both by 2)
6th box: 5 (10/2=5)
Answer: 78
Step-by-step explanation:
I really don't know, this is to difficult