Use positive numbers to represent elevations above sea level and
negative numbers to represent
elevations below sea level. Colleen's
elevation is 6.5 meters at the
beginning of a hiking trail. After
walking a few minutes, she has
descended 12.2 meters. Which of
the following represents her new
elevation?
F
-18.7 m
5.7 m
H
-6.3 m
J
-5.7 m

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc

c. side angle side. u shares the same sides