question_answer

If the angle made by the equal arms of an isosceles triangle is 70 degrees, which of the following could be another angle of the triangle?

A) 55                                

B) 65

C) 90                                

D) 60

Correct Answer: A

Solution :

In \[\Delta \,\,ABC\],       AB=AC Then,   \[\angle \,\,ABC=\angle \,\,ACB={{x}^{{}^\circ }}\] \[\therefore \]      \[x+x+70=180{}^\circ \] \[2x=110{}^\circ \] \[x=55{}^\circ \]