Subject: RE: Calling all engineering/math nerd types!!!!!It depends on what is given. You have an Isosceles triangle, ABC with side AB congruent to side AC.
Because it's Isosceles, that means that the Base Angles are congruent. So,
Angle ABC = Angle ACB.
(Draw a picture cause anything involving shape is easier to understand with a visual. )
Because it's a triangle, you know that the total sum of all angles is 180 degrees.
Now:
Let m (a variable ) be the measure of Angle ABC.
So:
m = Angle ABC
AND
m = Angle ACB because Angle ABC = Angle ACB (property of isosceles triangles )
Therefore:
Angle ABC + Angle ACB + Angle BAC = 180 degrees
Rewrite as:
m + m + Angle BAC = 180 degrees
Then:
2m + Angle BAC = 180 degrees.
This is as far as I can go without at least one more piece of information.
PS - The proper term is Geek. As in, "What a total math geek." ![](https://beginnertriathlete.com/discussion/images/emoticons/smile.gif) |