question_answer

If the length of each of two equal sides of an isosceles triangle is 10 cm and the adjacent angle is \[45{}^\circ ,\] then the area of the triangle is                                     

A)  \[12\sqrt{2}\,square\,cm.\]         

B)  \[15\sqrt{2}\,square\,cm.\]         

C)  \[20\sqrt{2}\,square\,cm.\]         

D)  \[25\sqrt{2}\,square\,cm.\]

E)  None of these