Please help!! Watch help video Find the length of the third side. If necessary, write in simplest radical form.

10 units

Step-by-step explanation:

Using Pythagoras' identity in the right triangle

The square on the hypotenuse is equal to the sum of the squares on the other 2 sides.

let x represent the third side ( hypotenuse ) , then

x² = 7² + ( )² = 49 + 51 = 100 (take square root of both sides )

x = = 10

The third side is 10 units

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this