Given that the side of the square has a length $b-a,$ find the area of one of the four triangles and the area of the small inner square.

Give the area of one of the triangles followed by the area of the small inner square separated by a comma. Express your answers in terms of the variables a and $b.$

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$A_{\text{t}\text{r}\text{i}\text{a}\text{n}\text{g}\text{l}\text{e}},A_{\text{s}\text{q}\text{u}\text{a}\text{r}\text{e}}=$