the average of two non-congruent angles of an isosceles triangle is 65. find the value of these two non-congruent angles? Share with your friends Share 3 Neha Sethi answered this Dear student We know, in an isosceles triangles two angles are equal.Let the two equal angles be x° each.and unequal angle by y°Given: Average of non-congruent angles=65°x+y2=65°⇒x+y=130°⇒x=130°-y ....(1)Also, by angle sum property of △x+x+y=180°⇒2x+y=180°⇒2(130°-y)+y=180° using 1⇒260°-2y+y=180°⇒y=80°and x=130°-y⇒x=130°-80°⇒x=50° Regards 1 View Full Answer