Answer:
your day going so far so good 1
Notice the tickmark on the angles, those angles are equal to each other.
now, notice the angle at the very top, the large triangle is really sharing it with smaller-inscribed triangle, and therefore is equal on both triangles.
therefore, the larger triangle, is similar with smaller-inscribed triangle by AA.
what the dickens does that mean?

The lost percentage is 25%
The percentage remaining is 75%
- Thanks
- ThanksHope it helps
7) 8.9
8) 6.7
9) 12.2
10) 7.6
11) 7.3
12) 6.3