Answer
$A=\frac{1}{2}s^{2}$
Work Step by Step
1. In this 45-45-90 triangle, the base and the height are both $s$.
2. Substitute and simplify.
$A=\frac{1}{2}bh$
$A=\frac{1}{2}\times s\times s$
$A=\frac{1}{2}s^{2}$
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