Question: How can you prove a triangle is an equilateral triangle? l 0 Use the distance formula to see if at least two sides are congruent.

How can you prove a triangle is an equilateral triangle? l 0 Use the distance formula to see if at least two sides are congruent. l 0 Use the slope formula to see if any sides are perpendicular: l 0 Use the distance formula to see if all three sides are congruent. l 0 Use the slope formula to see if any sides are parallel. Lydia graphed AXYZ at the coordinates X (0, 4), Y (2, 3), and Z (2, 6). She thinks AXYZ is a right triangle. ls Lydia's assertion correct? ' 0 Yes; the slopes of E and are the same. ' 0 Yes; the slopes of and )6 are opposite reciprocals. ' O No; the slopes of and E are not the same. ' O No; the slopes of Rand E are not opposite reciprocals

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