The simplified form of this polynomial is (n(20n + 1))/5
The 2 angles are complemantary or form right angles so

so

. Plugging that into BDC we get 11
Answer:
I think it's just 2 numbers you add together to get that number. for example number 6 you could add 10 and 5 in the circles to get 15 then you add 15 and 4 to get 19