text: If it is an isosceles triangle, and you drop a height from the angle between the 14's, then you're creating two right triangles with hypotenuse 14 and one leg 9 (the height bisects the base of the triangle).  Using some trig, you can find the base angle.  From the point of view of that angle, 9 is an adjacent side, and 14 is a hypotenuse.  So,\n\ncos x = 9/14\ncos x = 0.6429\nx = 50 (look it up in a table or use your cos^(-1) function on your calculator)\n\nSo your answer is (a).