Fórmula 2

b e g i n a r r a y l 1 . m a t h r m D i m e n s i o n a m e n t o m a t h r m r a t i o m a t h r m d e v i d o a m a t h r m f o r ç a n o r m a l m a t h r m n = f r a c {m a t h r m N}_{} m a t h r m E d {m a t h r m N}_{m a t h r m p l, m a t h r m R d}

2 . m a t h r m S e c ç ã o m a t h r m p a r a m e t e r m a t h r m a l p h a = f r a c m a t h r m A - 2 c d o t m a t h r m b c d o t {m a t h r m t}_{} m a t h r m f m a t h r m A l e q 0, 5 e n d a r r a y

;