How can you prove a triangle is isosceles?

use the distance formula to see if at least two sides are congruent. < -- my answer

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.

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

Step-by-step explanation:

We know that an isosceles triangle is a triangle whose atleast two sides are congruent.

So if we need to prove a triangle is isosceles then we need to prove that its atleast two sides are congruent. or equal.

Therefore, we can use the first method to prove the triangle is isosceles.

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

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.