In a quadrilateral
,
, and
. Find
to 2 decimal places.
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sin ( 4 1 ) A E = sin ( 5 4 ) 1 , sin ( 4 2 ) B E = sin ( 4 3 ) A E , sin ( 5 1 ) C E = sin ( 4 4 ) B E
C E = sin ( 4 4 ) sin ( 5 1 ) × sin ( 4 3 ) sin ( 4 2 ) × sin ( 5 4 ) sin ( 4 1 ) = 0 . 8 9 0 1 1
In the △ C D E the ∠ C E D = 9 5 ∘ and the sides next to it are 1 and 0.89011. C D can be obtained from the law of cosines as
C D = 1 + 0 . 8 9 0 1 1 2 − 2 × 0 . 8 9 0 1 1 × cos ( 9 5 ) = 1 . 3 9 5 5
The law of sines applied to the △ C D E provides x as
x = arcsin ( 1 . 3 9 5 5 sin ( 9 5 ) ) = 4 5 . 5 5 ∘