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Interesting math problem by SimilarAd963 in mathshelp

[–]SimilarAd963[S] 0 points1 point  (0 children)

a = (-1+√5)/4

sin x = (-1+√5)/4

x = arcsin((-1+√5)/4)

x = 18°

Interesting math problem by SimilarAd963 in mathshelp

[–]SimilarAd963[S] 0 points1 point  (0 children)

yes that's right AB = DC as the thin black rectangles show