Question 228895: find the measures of an isosceles triangle if the measure if the vertex angle is 40 degrees less than the sum of the base angles Answer by edjones(7311) (Show Source):
You can put this solution on YOUR website! let the vertex angle=v and a base angle=b
v=2b-40 given
2b+v=180 all the angles of a triangle add up to 180.
2b+2b-40=180 replace v with 2b-40
4b=220
b=55
v=70
.
Ed
