question_answer

Which of the following is the area of an isosceles triangle with equal sides b and base a?

A) \[\frac{a}{2}\sqrt{{{b}^{2}}-{{a}^{2}}}\]     

B)   \[\frac{1}{2}a\sqrt{4{{b}^{2}}-{{a}^{2}}}\]

C)   \[\frac{a}{4}\sqrt{{{b}^{2}}-{{a}^{2}}}\]     

D)   \[\frac{a}{4}\sqrt{4{{b}^{2}}-{{a}^{2}}}\]