In a given figure AB 9 CM BC 12 cm and AC 15 CM. BC is perpendicular to AC find angle ABC

Which triangle congruence postulate or theorem justifies my claim that the steps i made using construction paper and scissors produce an isosceles triangle? was it sss, sas, asa, aas, or hl?

Plz ( true - false) all triangles have interior angles whose measure sum to 90.

Which of the following scenarios demonstrates an exponential decay