First, solve for the length of each side using the Distance Formula.
Then, solve for the area of triangle.
The measure of each side:
Sides 1 and 3 (legs of isosceles triangle) = [tex] 5\sqrt{2} [/tex]
Side 2 (base of the triangle) = [tex]2 \sqrt{5} [/tex]
ANSWER: The area is 15 units².
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