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Question Number 15982 by b.e.h.i.8.3.4.1.7@gmail.com last updated on 16/Jun/17

Commented by b.e.h.i.8.3.4.1.7@gmail.com last updated on 17/Jun/17

$i n t r i a n g l e A B C :$ $∠ A B C = 120^{∙}, A B = c, B C = a, C A = b$ $D, E, F : i n t e r s e c t s o f (i n) b i s e c t o r o f$ $a n g l e s w i t h o p p o s i t e s i d e s .$ $. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .$ $s h o w t h a t :$ $1) ∠ D E F = 90^{∙}$ $2) \frac{A C}{D F} = \sqrt{3} + 1 .$
Commented by ajfour last updated on 16/Jun/17

$s o m e m o r e e x p l a n a t i o n a b o u t$ $t h e s e i n b i s e c t o r s . .$
Commented by b.e.h.i.8.3.4.1.7@gmail.com last updated on 16/Jun/17

$i n b i s e c t o r, d i v i d e s t h e a n g l e A i n 2$ $e q u a i l p a r t s .$ $w e h a v e (i n) a n d) o u t (b i s e c t o r s f o r a n y$ $a n g l e s o f a t r i a n g l e .$
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