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Trigonometry
Pregunta

Two secants \(C B\) and \(E D\) of a circle meet i...

Two secants \(C B\) and \(E D\) of a circle meet in point \(A\) outside the circle. DF is a tangent to the circle at D. \(\angle B D F = \angle F A D\) 

\(= 30 ^ { \circ } .\) Which of the following statements is necessarily true? 1] \(G\) is the centre of the circle 2] \(B E\) is perpendicular to \(C D\) 3] \(\angle C E B\) measures \(45 ^ { \circ }\) 

4] \(l ( A B ) + I ( B E ) = I ( A D ) + l ( D C )\) 

Answer

2

Solución
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