who gave the midpoint theorem and angle bisector theorem in triangles????????

Just about all geometry theorem arises from the works of Euclid, the Greek mathematician from Alexandria, Egypt.

All other mathematicians such as Eular used Euclidean theory as the basis of their theorems and postulates.

a) and b) are the line section that bisects HJ c) is "given" d) is the way you already know they are congruent e) is the reason subject concerns are congruent to themselves f) is SSS (subsequently of certainty which you have not have been given any information on any angles) g) is what helps you to break congruent triangles into corresponding aspects i'm hoping that factors you indoors the dazzling direction

U could refer 10th &8th or 9th books resp.for confirmation.