Answer:
The length of the other leg is
![3.21\ units](https://img.qammunity.org/2020/formulas/mathematics/middle-school/zyg0b7ps7jwprj8sb2ln5lj6m2r56x2cn5.png)
Explanation:
I will assume that the triangle is a right triangle
In a right triangle the legs are perpendicular
so
The area of a right triangle is equal to
![A=(1)/(2)(a)(b)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/9mhp5q8ujls9ay5decyvv4db2v0e6p1ttl.png)
where
a and b are the legs of the triangle
In this problem we have
![a=39.2\ units](https://img.qammunity.org/2020/formulas/mathematics/middle-school/tf7jb4jswc2ct7cw8et8pv4kodyszfgms7.png)
![A=63\ units^(2)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/dfux8vb4y13lmex7prgwz72yhiheu3ikb0.png)
substitute the values
![63=(1)/(2)(39.2)(b)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ohttm229jwxywzwp14m00mdyea47w4qo8j.png)
![126=(39.2)(b)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/g7k13fyfamog2t9qtri5whqpo0n2iz0e7u.png)
![b=126/(39.2)=3.21\ units](https://img.qammunity.org/2020/formulas/mathematics/middle-school/99dbzk5cj3rgjpb49m1lfchj8ko6bzu819.png)