Of 120 visitors to an amusement park, 84 stayed for at least 3 hours, 76 spent at least $20, and 60 stayed for at least 3 hours and spent at least $20. what is the probability that a randomly selected visitor stayed for at least 3 hours and spent less than $20?

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