Known isosceles triangle ABC, BC=AC, angle ABC=70 degrees, P is a point in the triangle, connecting PA, PB, PC, known angle PCB=30 degrees, angle PAB=50 degrees, and finding the angle PBC 1/5- elite network.

/Math/Search? c = 0 & ampq = % E5 % B7 % B2 % E7 % 9F % A5 % E7 % AD % 89% E8 % 85% B0 % E4 % B8 % 89% E8 % A7 % 92% E5 % BD % A2 ABC % E4 % B8 % AD % E3 % 80% 8 / kloc-0/BC % 3d AC % E3 % 80% 8 1+% E8 % A7 % 92 ABC % 3d 70% E5 % BA % A6 % E3 % 80% 865