vertex angle
posted by Anonymous .
The three angles add to 180 degrees. Also , the two base angles of the isoscele triangle are equal, ..
Set those base angles equal, and solve for x.
Put that value of x into the given, and compute the base angles.
The third angle will be the amount to add to the two base angles to get 180 deg
how do I find the vertex angle of an isosceles triangle with base angles of (4x9) and (3x+2).

45 degrees 45 degrees and 90 degrees