Lets look at the steps to construct
- First put compass on point A .
- Take more distance than half of AC.
- Then tick a little semicircle.
- Plot the compass on C.
- Now join the intersection point with B.
We are done
Okay, so let's find the average
People with 92: 18(92)
People with 84: 12(84)
1656 + 1008 = 2664
So then we divide by 30
2664 / 30: 88.8
The average is a score of 88.8
All of them but B because a polygon only needs 3 or more sides when B isn't really a figure.