# Another Isosceles Triangle Problem

## Homework Statement

In isosceles triangle RST, RS = RT. Which side of the triangle is the base? Which angle is the vertex angle?

## The Attempt at a Solution

I believe the base is RT, and the vertex angle is S. I don't know the proper notation to name the line segment and the angle, though. How would you write the answer properly?

## Answers and Replies

Dick
Science Advisor
Homework Helper
Why do you think that? Draw a triangle and label the vertices R, S and T. RS is the segment connecting R and S. RT is the segment connecting R and T. What's the segment that is the base?

My goodness, I have made a few good blunders in these past two posts. It should actually be RS = ST

Dick
Science Advisor
Homework Helper
My goodness, I have made a few good blunders in these past two posts. It should actually be RS = ST

Ok, then I'll agree with you. Base is RT and the vertex angle is the angle at vertex S. Sometimes you'll see that written as $\angle RST$.

Thank you so much. Sorry for all of the posts--I have a great geometry textbook I found, but no answer key to accompany it.