ANSWER
E. 10
EXPLANATION
Using Pythagoras Theorem, which says the hypotenuse squared is equal to the sum of squares of the two shorter legs.
![{h}^(2) = {(5 √(2) )}^(2) + {(5 √(2) )}^(2)](https://img.qammunity.org/2020/formulas/mathematics/high-school/jlwo8i1lxhz8arp70s91zh53qrqqmugpbu.png)
Evaluate the squares on the RHS.
![{h}^(2) = 25 * 2 + 25 * 2](https://img.qammunity.org/2020/formulas/mathematics/high-school/d44h7ia2ictlk6vszmuxcogdficbntvv4i.png)
![{h}^(2) = 50 + 50](https://img.qammunity.org/2020/formulas/mathematics/high-school/gifd8plscwzirterom1de7bvc9sg79feiy.png)
Simplify:
![{h}^(2) = 100](https://img.qammunity.org/2020/formulas/mathematics/middle-school/53eagmoikuppilx586yn3sv7d1hvfuf3y9.png)
Take positive square root.
![h = √(100)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/qu90k71r0fyqpfkfihgy49h43yifnn8xga.png)
![h = 10](https://img.qammunity.org/2020/formulas/mathematics/middle-school/8r6lv13je239jfd63rsh126dakxfk7w4ar.png)
The hypotenuse is 10 units.
The correct answer is E