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Mathematics 19 Online
OpenStudy (anonymous):

How can you prove a triangle is isosceles? Use the distance formula to see if at least two sides are congruent. Use the slope formula to see if any sides are perpendicular. Use the distance formula to see if all three sides are congruent. Use the slope formula to see if any sides are parallel.

OpenStudy (anonymous):

Use the distance formula to see if at least two sides are congruent. This is because an isosceles triangle has two sides equal.

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