Question

$\angle ABC$ as shown in the figure below equal

• A. ${60}^o$
• B. ${120}^o$
• C. ${150}^o$
• D. ${90}^o$

Answer 1

The correct option is B ${120}^o$

All of the angles in an equilateral triangle is of 60(degrees) So,

$\begin{array}{c}\angle ABD=\angle CBD={60}^{\circ }\\ As,\angle ABC=\angle ABD+\angle CBD\\ ={60}^{\circ }+{60}^{\circ }\\ ={120}^{\circ }\end{array}$

Thus option B