The longest side is called the hypotenuse and that is the side we need to find. To find the side you have to use Pythagoras theorem! This means Asquared +Bsquared= C squared
This means you have to do 9 x9 which is 81 + 10x10 which is 100!
Once you have added 100and 81 you get 181 and you will need to square root that number. The answer to this is 13.45 or you could just write the 181 in the square root sign!
I hope this helps you!
By questions please ask!!!
Also please can u have brainiest?!!
