LESSON 5.2 – 5.4, Part I Challenge Practice

LESSON 5.2 – 5.4, Part I
Challenge Practice
1. Find the values of x and y.
2. Prove that the angle bisector of the vertex angle of an isosceles triangle is also the perpendicular
bisector of the base of the triangle. Include a drawing in your proof.
In Exercise 3, use the following information to find the area of the triangle described.
The formula below can be used to find the area A of a triangle using the measures of the medians m.
A
4
1
s( s  m1 )( s  m2 )(s  m3 ) , where s  (m1  m2  m3 ) .
3
2
3. ml = 3, m2 = 6, m3 = 7