The
is a rectangle. The
pont is over
on line
, such that
, and
.
This figure is not drawn to scale
If , then find the length of the line segment!
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Since ∠ E D A = 6 0 ° , ∠ E D C = 9 0 ° − 6 0 ° = 3 0 ° , and it is clear that \angle D C E = 9 0 ° + 3 0 ° = 1 2 0 ° . From that ∠ C E D = 1 8 0 ° − 1 2 0 ° − 3 0 ° = 3 0 ° .
So △ C D E is isosceles, since it has two equal angles. A B C D is a rectangle, so A B = 1 2 = C D = C E . Note that △ B C E is a half-equilateral triangle, because if we reflect E to B , the △ E ′ C E will be equilateral. So C E = 2 ∗ B E = 1 2 .
Therefre B E = 6 .