Answer:
11, square with side length of 11 units
Explanation:
We know that to find the area of a triangle you follow this formula :
![1/2bh](https://img.qammunity.org/2021/formulas/mathematics/high-school/tnieyk6djg6wgk0ymr8g4aalzsy9lv6nye.png)
The area of this triangle is 121 ( 22 * 11 * .5)
And we know that the formula for the area of a square is
![length * width](https://img.qammunity.org/2021/formulas/mathematics/college/d09d2h2pro97a2c4gj39eeus1t5m7jey23.png)
We also know that all sides of a square are the same length, so we can use the equation of
![Length^2 =area](https://img.qammunity.org/2021/formulas/mathematics/high-school/cdlaycn265j25luzd84ddumzkp3npo6tgz.png)
We can now substitute the area of the triangle in for the area of the square.
![Length^2 =121](https://img.qammunity.org/2021/formulas/mathematics/high-school/12n5i5m64dj9fymbilu94882wny0j64rhb.png)
Find the square root of both sides
![√(length^2) = √(121)](https://img.qammunity.org/2021/formulas/mathematics/high-school/9h6ztj5yf6ii1cyj7smy414m89ii2s1gg5.png)
Simplify
![length=11](https://img.qammunity.org/2021/formulas/mathematics/high-school/tgnbtzw29t497701miodb6ev1a3gikqvku.png)