The other endpoint would be (4,1)
<span>77.5% can also be written as 77.5/100, but if you're the mathematical notation police, people don't like decimals on a fraction, sooo, an equivalent form is: </span>
<span>
= (77.5)/(100) * (2/2)
= 155/200
= 31/40
= 0 31/40 </span>
Use Pythagorean thrm
17^2+10^2=21^2
289+100=441
389≠441
This is not a right triangle