1. ## RightAngels / Verticies

2. Do you really expect someone to do all of that HW for you? It would help if you told us what exactly you were having trouble with. I will do one of them though and maybe you can figure out some of the others...

2. Given: $\vartriangle RST$ with vertices $R = ( - 1, - 1)$, $S = ( - 1, 3)$, & $T = ( 3, 1)$
Find $\left| {RT} \right|$.

The formula for the distance between two points $A=(x_0,y_0)$ & $B=(x_1,y_1)$ is $\sqrt {(x_1 - x_0 )^2 + (y_1 - y_0 )^2 }$.

So we have $\sqrt {(3 - ( - 1))^2 + (1 - ( - 1))^2 } = \sqrt {(3 + 1)^2 + (1 + 1)^2 } = \sqrt {16 + 4} = \sqrt {20} \approx 4.5$