A right triangle is formed by connecting coordinates (5,-2), (2, -3), and (-1, 6). What is the area of the triangle in square units?
(Step by step explanation pleasee)

Solve 2x+y=3 x+y=5 in substitution method

Joanie watched 1 out of three of a movie in the morning

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?