Question 1208013
You can handle the one using slopes yourself.


Using Pythagorean Theorem, apply distance formula to find these lengths:
{{{AB=2sqrt(5)}}};
{{{AC=5sqrt(5)}}};
{{{BC=sqrt(145)}}};


and then expect {{{(sqrt(145))^2=(2sqrt(5))^2+(5sqrt(5))^2}}}, which you will find is true.