Warm-upwith 4.2 Notes on Isosceles Triangles

2) Copy Angle EBC and name it Angle LMN.-------------------------------------------

3) Copy EC and add it to JK. ------------------------------------------------- --------------------------------------------

Answers to 3.1 # 1 - 4

Answers to 4.1 #2-9 all numbers

Student of the day!Block 1

Student of the day!Block 3

Constructing a Perpendicular Bisector pg. 150Also the way you find midpoint.

Constructing a median on a triangle: Find the midpoint of one side of the triangle. Then connect the midpoint to the opposite vertex.

4.2 Isosceles TriangleIsosceles Triangles have special names for their angles and sides.

Practice Problems

1) An isosceles triangle has a vertex angle that measures30 degrees. What are the other angle measures?

2) An isosceles triangle has a base angle that measures 70degrees. What are the other angle measures?

3.2 and 4.2 Conjectures

C-5 Perpendicular Bisector Conjecture – If a point is on the

perpendicular bisector, then __________________.

C-6 Converse of the Perpendicular Bisector – If a point isequidistant from the endpoints of a segment, then it is on

the ________________ of the segment.

C-19 Isosceles Triangle Conjecture - If a triangle is isosceles,

then _____________________. C-20 Converse of the Isosceles Triangle Conjecture - If a

triangle has two congruent angles, then _______________.

H.W. Assignment3.2 pg 151 – 152 #1,2, 4 and 74.2 pg 208 – 209 # 2- 14 even #s

Help with #1413) Complete the statement.Remember to write the congruent parts in order.

_______GEA