Question

question 7 (multiple choice worth 1 points) (04.01r mc) 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.

Explanation:

An isosceles triangle is defined as a triangle with at least two congruent (equal-length) sides. The distance formula calculates side lengths, so using it to check for at least two equal sides proves a triangle is isosceles. Checking for perpendicular sides relates to right triangles, checking all three congruent sides relates to equilateral triangles, and triangles cannot have parallel sides.

Answer:

A. Use the distance formula to see if at least two sides are congruent.