The figure below shows two triangles efg and klm.

two triangles efg and klm are drawn. angle kml is a right angle. the measures of the sides of the triangles are: in triangle efg, eg measures a, gf measure b, and ef measures c. in triangle klm, km measures a and ml measures b.

which step can be used to prove that triangle efg is also a right triangle?

prove that the sum of a and c is greater than b.

prove that the sum of a and b is greater than c.

prove that triangles are congruent by sss property and hence angle egf is equal to angle kml.

prove that the ratio of ef and kl is greater than 1 and hence the triangles are similar by aa postulate.