begin mathsize 12px style Given space we space have space straight a space increment ABC comma space such space that space angle ABC greater than angle ACB
To space prove space that colon space AC space greater than space AB
Construct space BD space on space AC space such space that space angle DBC equals angle ACB... left parenthesis Since space angle ABC greater than angle ACB comma space we space can space find space straight a space point space on space AC space that space is space straight D
such space that space angle DBC equals angle ACB right parenthesis end style