Respuesta :

kamelia

Answer:

B

Step-by-step explanation:

By finding x we will know the triangle is the isosceles triangle. So both high and base are a.

So the area will be:

[tex] \frac{h \times b}{2} \: \: so \: \: \: \frac{ a\times a}{2} = \frac{ {a}^{2} }{2} [/tex]

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