The base in the area of a triangle is _____.

We know that the area of a triangle = $\frac{1}{2}\times \mathrm{base}\times \mathrm{height}$

Therefore, the base of a triangle = $\frac{2\times \mathrm{area} \mathrm{of} \mathrm{a} \mathrm{triangle}}{\mathrm{height}}$