Given that 1st graph and 2n graph, which theorem or postulate proves δpqr 3rd graph δrst?

hl congruence theoremasa congruence postulatesas congruence postulatesss congruence postulate

HL congruence theorem is the answer.

Hope this helps :)

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct