Question

I need help with number 3, someone please help me.

Answer 1

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:

$\frac{h \times b}{2} \: \: so \: \: \: \frac{ a\times a}{2} = \frac{ {a}^{2} }{2}$