Respuesta :
[tex]Area\;of\;Triangle = \frac{Base \times Height}{2}\\\\Given\;Base = b\;and\;Height = \frac{b}{2}\\\\Area\;of\;Triangle = \frac{(b)(\frac{b}{2})}{2} = \frac{1}{4} \times b^2[/tex]
1st Option is Right
Changeing h for b/2 we have
[tex]A = \frac{1}{2} b (\frac{b}{2}) = \frac{b^2}{4}[/tex]