​the base angles are congruent

​it is isosceles

​***Write both conjectures in your notebook. We will not be doing this investigation.

• ​Copy and complete this proof in your notebook.

• The next slide(s) will show the answer. There are two options

• I encourage you to attempt on your own first.

​Answer Option 1

​Answer Option 2

Summarizing Questions Explained...

True/False. An isosceles triangle has exactly two congruent sides.

• This would be false because an isosceles triangle has at least two congruent sides. (See slide 3)

True/False. The vertex angle of an isosceles triangle is always at the top.

• This would be false because the vertex angle is formed by the two legs. This means the triangle could be turned in any different direction and the vertex angle would be the same. (See slide 3)

True/False. An equiangular triangle is always equilateral.

• This would be true because every equilateral triangle is also an isosceles triangle, so any two sides that are equal have equal opposite angles. Since all three sides of an equilateral triangle are congruent, all three angles are congruent too.

Homework: 5.4 WS