(ASAP PLEASE) so I know the answer is 8 root three but I always come to a dead end up while working it out.

(2 + √3)^2 - (2 - √3)^2 (expand the expressions)

4 + 4√3 + 3 - (4 - 4√3 + 3) (calculate)

4 + 4√3 + 3 - (7 - 4√3) (remove the parantheses)

4 + 4√3 + 3 - 7 + 4√3 (calculate and collect like terms)

0 + 8√3 (remove 0)

8√3

127

whether it's diameter, or radius, i believe if i remember correctly from school, every amount has to always add up to 180. so if you take 53, and starting adding, long story short, taking 127 and adding it to 53, gives you 180.